Private Gateway prevents VPC from starting (4.21.0)

### problem

On a complex VPC with many network tiers, adding a private gateway appears to succeed, but doesn't work (e.g. can't actually ping). 

Example:

<img width="458" height="705" alt="Image" src="https://github.com/user-attachments/assets/f9ec1def-fe25-48b9-b9eb-520acfa62900" />

Then attempting to restart the VPC results in a failure of the VPC coming online with this error:

<img width="340" height="167" alt="Image" src="https://github.com/user-attachments/assets/6dad22ee-ad9b-45bf-bd5e-0e76b06974e2" />

What is more interesting is when adding to a VPC with only a single network tier, everything works!

I know there are limitations to the number of tiers you can add to a VPC (which from my testing appears to be in the low 20s) due to PCI bus limitations with the vNICs, but I am well below that number at 11.  I even removed one of my network tiers and retested to confirm.

Here is the error in the agent log:
```
2025-11-03 14:44:08,906 WARN  [kvm.resource.LibvirtComputingResource] (AgentRequest-Handler-4:[]) (logid:b9db2fa9) Setting System VM's [VM {id: "358", name: "r-358-VM", uuid: "c8b83770-12c5-4316-bf48-aa0a110b7ac7", type: "DomainRouter"}] current memory as max memory [524288].
2025-11-03 14:44:08,907 INFO  [kvm.storage.LibvirtStorageAdaptor] (AgentRequest-Handler-4:[]) (logid:b9db2fa9) Trying to fetch storage pool 824b8d90-5fd8-3d34-9008-e982e8a4196c from libvirt
2025-11-03 14:44:09,621 INFO  [kvm.storage.LibvirtStorageAdaptor] (AgentRequest-Handler-4:[]) (logid:b9db2fa9) Trying to fetch storage pool 824b8d90-5fd8-3d34-9008-e982e8a4196c from libvirt
2025-11-03 14:44:09,627 WARN  [kvm.resource.LibvirtKvmAgentHook] (AgentRequest-Handler-4:[]) (logid:b9db2fa9) Groovy script '/etc/cloudstack/agent/hooks/libvirt-vm-xml-transformer.groovy' is not available. Transformations will not be applied.
2025-11-03 14:44:09,627 WARN  [kvm.resource.LibvirtKvmAgentHook] (AgentRequest-Handler-4:[]) (logid:b9db2fa9) Shell script '/etc/cloudstack/agent/hooks/libvirt-vm-xml-transformer.sh' is not available. Transformations will not be applied.
2025-11-03 14:44:09,627 WARN  [kvm.resource.LibvirtKvmAgentHook] (AgentRequest-Handler-4:[]) (logid:b9db2fa9) Groovy scripting engine is not initialized. Data transformation skipped.
2025-11-03 14:44:10,295 WARN  [kvm.resource.LibvirtKvmAgentHook] (AgentRequest-Handler-4:[]) (logid:b9db2fa9) Groovy script '/etc/cloudstack/agent/hooks/libvirt-vm-state-change.groovy' is not available. Transformations will not be applied.
2025-11-03 14:44:10,295 WARN  [kvm.resource.LibvirtKvmAgentHook] (AgentRequest-Handler-4:[]) (logid:b9db2fa9) Shell script '/etc/cloudstack/agent/hooks/libvirt-vm-state-change.sh' is not available. Transformations will not be applied.
2025-11-03 14:44:10,295 WARN  [kvm.resource.LibvirtKvmAgentHook] (AgentRequest-Handler-4:[]) (logid:b9db2fa9) Groovy scripting engine is not initialized. Data transformation skipped.
2025-11-03 14:44:41,085 WARN  [kvm.resource.LibvirtComputingResource] (AgentRequest-Handler-4:[]) (logid:b9db2fa9) Execution of process [2132372] for command [/usr/share/cloudstack-common/scripts/network/domr/router_proxy.sh update_config.py 169.254.100.212 static_routes.json.493167a5-706d-4b08-ba8e-c0c3d9c6ecf7 ] failed.
2025-11-03 14:44:41,085 WARN  [kvm.resource.LibvirtComputingResource] (AgentRequest-Handler-4:[]) (logid:b9db2fa9) Exception [Stream closed] occurred when attempting to run command [/usr/share/cloudstack-common/scripts/network/domr/router_proxy.sh update_config.py 169.254.100.212 static_routes.json.493167a5-706d-4b08-ba8e-c0c3d9c6ecf7 ]. java.io.IOException: Stream closed
	at java.base/java.io.BufferedInputStream.getBufIfOpen(BufferedInputStream.java:168)
	at java.base/java.io.BufferedInputStream.read(BufferedInputStream.java:334)
	at java.base/sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:287)
	at java.base/sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:330)
	at java.base/sun.nio.cs.StreamDecoder.read(StreamDecoder.java:190)
	at java.base/java.io.InputStreamReader.read(InputStreamReader.java:177)
	at java.base/java.io.BufferedReader.fill(BufferedReader.java:162)
	at java.base/java.io.BufferedReader.readLine(BufferedReader.java:329)
	at java.base/java.io.BufferedReader.readLine(BufferedReader.java:396)
	at com.cloud.utils.script.OutputInterpreter.processError(OutputInterpreter.java:41)
	at com.cloud.utils.script.Script.execute(Script.java:305)
	at com.cloud.hypervisor.kvm.resource.LibvirtComputingResource.executeInVR(LibvirtComputingResource.java:632)
	at com.cloud.agent.resource.virtualnetwork.VirtualRoutingResource.applyConfigToVR(VirtualRoutingResource.java:315)
	at com.cloud.agent.resource.virtualnetwork.VirtualRoutingResource.applyConfig(VirtualRoutingResource.java:330)
	at com.cloud.agent.resource.virtualnetwork.VirtualRoutingResource.executeRequest(VirtualRoutingResource.java:170)
	at com.cloud.hypervisor.kvm.resource.wrapper.LibvirtNetworkElementCommandWrapper.execute(LibvirtNetworkElementCommandWrapper.java:35)
	at com.cloud.hypervisor.kvm.resource.wrapper.LibvirtNetworkElementCommandWrapper.execute(LibvirtNetworkElementCommandWrapper.java:29)
	at com.cloud.hypervisor.kvm.resource.wrapper.LibvirtRequestWrapper.execute(LibvirtRequestWrapper.java:78)
	at com.cloud.hypervisor.kvm.resource.LibvirtComputingResource.executeRequest(LibvirtComputingResource.java:2240)
	at com.cloud.agent.Agent.processRequest(Agent.java:813)
	at com.cloud.agent.Agent$AgentRequestHandler.doTask(Agent.java:1295)
	at com.cloud.utils.nio.Task.call(Task.java:83)
	at com.cloud.utils.nio.Task.call(Task.java:29)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at java.base/java.lang.Thread.run(Thread.java:840)

2025-11-03 14:44:42,854 INFO  [kvm.resource.LibvirtDomainListener] (Thread-0:[]) (logid:) Triggering out of band status update due to completed self-shutdown or crash of VM
2025-11-03 14:44:43,249 WARN  [kvm.resource.LibvirtKvmAgentHook] (AgentRequest-Handler-3:[]) (logid:b9db2fa9) Groovy script '/etc/cloudstack/agent/hooks/libvirt-vm-state-change.groovy' is not available. Transformations will not be applied.
2025-11-03 14:44:43,250 WARN  [kvm.resource.LibvirtKvmAgentHook] (AgentRequest-Handler-3:[]) (logid:b9db2fa9) Shell script '/etc/cloudstack/agent/hooks/libvirt-vm-state-change.sh' is not available. Transformations will not be applied.
2025-11-03 14:44:43,250 WARN  [kvm.resource.LibvirtKvmAgentHook] (AgentRequest-Handler-3:[]) (logid:b9db2fa9) Groovy scripting engine is not initialized. Data transformation skipped.
2025-11-03 14:44:43,970 INFO  [kvm.resource.LibvirtConnection] (AgentRequest-Handler-5:[]) (logid:b9db2fa9) No existing libvirtd connection found. Opening a new one
2025-11-03 14:44:43,971 WARN  [kvm.resource.LibvirtConnection] (AgentRequest-Handler-5:[]) (logid:b9db2fa9) Can not find a connection for Instance r-358-VM. Assuming the default connection.
2025-11-03 14:44:44,021 WARN  [kvm.resource.LibvirtKvmAgentHook] (AgentRequest-Handler-5:[]) (logid:b9db2fa9) Groovy script '/etc/cloudstack/agent/hooks/libvirt-vm-state-change.groovy' is not available. Transformations will not be applied.
2025-11-03 14:44:44,021 WARN  [kvm.resource.LibvirtKvmAgentHook] (AgentRequest-Handler-5:[]) (logid:b9db2fa9) Shell script '/etc/cloudstack/agent/hooks/libvirt-vm-state-change.sh' is not available. Transformations will not be applied.
2025-11-03 14:44:44,021 WARN  [kvm.resource.LibvirtKvmAgentHook] (AgentRequest-Handler-5:[]) (logid:b9db2fa9) Groovy scripting engine is not initialized. Data transformation skipped.
```

I'm not sure how to get more information from within the systemvm.

The errors in the management server are below, but don't appear too helpful to me:
```
2025-11-03 14:00:54,178 WARN  [c.c.a.AlertManagerImpl] (CapacityChecker:[ctx-23059846]) (logid:f541c307) alertType=[21] dataCenterId=[1] podId=[null] clusterId=[null] message=[System Alert: Low Available Backup Storage in availability zone us-west-1].
","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.PlugNicAnswer":{"result":"true","details":"success","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.routing.GroupAnswer":{"results":["null - success: Creating file in VR, with ip: 169.254.152.21, file: ip_associations.json.4063441f-18a3-4edf-8b9e-2fc6a6da7580","null - success: Error: ipv4: FIB table does not exist.
"],"result":"true","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"true","details":"Nothing to do","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.PlugNicAnswer":{"result":"true","details":"success","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.routing.GroupAnswer":{"results":["null - success: Creating file in VR, with ip: 169.254.152.21, file: ip_associations.json.ce884acb-2ab5-4039-a21d-31a561203125","null - success: Error: ipv4: FIB table does not exist.
"],"result":"true","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.routing.GroupAnswer":{"results":["null - success: Creating file in VR, with ip: 169.254.152.21, file: network_acl.json.f1edc32c-ed5a-453d-9311-1145b49bc3ec","null - success: # Warning: table ip nat is managed by iptables-nft, do not touch!
# Warning: table ip filter is managed by iptables-nft, do not touch!
# Warning: table ip mangle is managed by iptables-nft, do not touch!
"],"result":"true","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.PlugNicAnswer":{"result":"true","details":"success","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.routing.GroupAnswer":{"results":["null - success: Creating file in VR, with ip: 169.254.152.21, file: guest_network.json.4782c8f6-8bd5-4ec8-914e-b69810e5a6f6","null - success: Error: ipv4: FIB table does not exist.
# Warning: table ip nat is managed by iptables-nft, do not touch!
# Warning: table ip filter is managed by iptables-nft, do not touch!
# Warning: table ip mangle is managed by iptables-nft, do not touch!
"],"result":"true","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.PlugNicAnswer":{"result":"true","details":"success","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.routing.GroupAnswer":{"results":["null - success: Creating file in VR, with ip: 169.254.152.21, file: guest_network.json.7e9302e7-d0cd-4b21-ac07-685cea2c9a3d","null - success: Error: ipv4: FIB table does not exist.
# Warning: table ip nat is managed by iptables-nft, do not touch!
# Warning: table ip filter is managed by iptables-nft, do not touch!
# Warning: table ip mangle is managed by iptables-nft, do not touch!
"],"result":"true","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.PlugNicAnswer":{"result":"true","details":"success","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.routing.GroupAnswer":{"results":["null - success: Creating file in VR, with ip: 169.254.152.21, file: guest_network.json.6834844e-25c1-4b7f-abeb-69666aabd9cb","null - success: Error: ipv4: FIB table does not exist.
# Warning: table ip nat is managed by iptables-nft, do not touch!
# Warning: table ip filter is managed by iptables-nft, do not touch!
# Warning: table ip mangle is managed by iptables-nft, do not touch!
"],"result":"true","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.PlugNicAnswer":{"result":"true","details":"success","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.routing.GroupAnswer":{"results":["null - success: Creating file in VR, with ip: 169.254.152.21, file: guest_network.json.2f87ffd7-05e5-4ba1-8713-ddb3112d0111","null - success: Error: ipv4: FIB table does not exist.
# Warning: table ip nat is managed by iptables-nft, do not touch!
# Warning: table ip filter is managed by iptables-nft, do not touch!
# Warning: table ip mangle is managed by iptables-nft, do not touch!
"],"result":"true","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.PlugNicAnswer":{"result":"true","details":"success","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.routing.GroupAnswer":{"results":["null - success: Creating file in VR, with ip: 169.254.152.21, file: guest_network.json.fb5d1ee7-2b96-4a24-91dd-d07bdfe0f509","null - success: Error: ipv4: FIB table does not exist.
# Warning: table ip nat is managed by iptables-nft, do not touch!
# Warning: table ip filter is managed by iptables-nft, do not touch!
# Warning: table ip mangle is managed by iptables-nft, do not touch!
"],"result":"true","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.PlugNicAnswer":{"result":"true","details":"success","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.routing.GroupAnswer":{"results":["null - success: Creating file in VR, with ip: 169.254.152.21, file: guest_network.json.8e985b32-3a91-4fec-8c42-f9efbe5a88da","null - success: Error: ipv4: FIB table does not exist.
# Warning: table ip nat is managed by iptables-nft, do not touch!
# Warning: table ip filter is managed by iptables-nft, do not touch!
# Warning: table ip mangle is managed by iptables-nft, do not touch!
"],"result":"true","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.PlugNicAnswer":{"result":"true","details":"success","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.routing.GroupAnswer":{"results":["null - success: Creating file in VR, with ip: 169.254.152.21, file: guest_network.json.268f4edd-2e8a-41ae-85ce-d5e5fc03c161","null - success: Error: ipv4: FIB table does not exist.
# Warning: table ip nat is managed by iptables-nft, do not touch!
# Warning: table ip filter is managed by iptables-nft, do not touch!
# Warning: table ip mangle is managed by iptables-nft, do not touch!
"],"result":"true","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.PlugNicAnswer":{"result":"true","details":"success","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.routing.GroupAnswer":{"results":["null - success: Creating file in VR, with ip: 169.254.152.21, file: guest_network.json.6eda11dc-0d52-4749-8133-d2985efdfdca","null - success: Error: ipv4: FIB table does not exist.
# Warning: table ip nat is managed by iptables-nft, do not touch!
# Warning: table ip filter is managed by iptables-nft, do not touch!
# Warning: table ip mangle is managed by iptables-nft, do not touch!
"],"result":"true","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.PlugNicAnswer":{"result":"true","details":"success","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.routing.GroupAnswer":{"results":["null - success: Creating file in VR, with ip: 169.254.152.21, file: guest_network.json.d85b543b-8c4f-4551-afe3-43cfc1c55909","null - success: Error: ipv4: FIB table does not exist.
# Warning: table ip nat is managed by iptables-nft, do not touch!
# Warning: table ip filter is managed by iptables-nft, do not touch!
# Warning: table ip mangle is managed by iptables-nft, do not touch!
"],"result":"true","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.PlugNicAnswer":{"result":"true","details":"success","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.routing.GroupAnswer":{"results":["null - success: Creating file in VR, with ip: 169.254.152.21, file: guest_network.json.9edb27a9-03c9-4a54-8853-cfd2c50ec4f0","null - success: Error: ipv4: FIB table does not exist.
# Warning: table ip nat is managed by iptables-nft, do not touch!
# Warning: table ip filter is managed by iptables-nft, do not touch!
# Warning: table ip mangle is managed by iptables-nft, do not touch!
"],"result":"true","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.PlugNicAnswer":{"result":"true","details":"success","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.routing.GroupAnswer":{"results":["null - success: Creating file in VR, with ip: 169.254.152.21, file: guest_network.json.c99d55ed-2c84-49c5-84e1-ea00810debcb","null - success: Error: ipv4: FIB table does not exist.
# Warning: table ip nat is managed by iptables-nft, do not touch!
# Warning: table ip filter is managed by iptables-nft, do not touch!
# Warning: table ip mangle is managed by iptables-nft, do not touch!
"],"result":"true","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.routing.GroupAnswer":{"results":["null - success: Creating file in VR, with ip: 169.254.152.21, file: static_routes.json.10ab581a-a46f-406d-910e-e824eeccfbe0","null - failed: java.io.IOException: Stream closed
	at com.cloud.utils.script.OutputInterpreter.processError(OutputInterpreter.java:41)
"],"result":"false","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}},{"com.cloud.agent.api.Answer":{"result":"false","details":"Stopped by previous failure","wait":"0","bypassHostMaintenance":"false"}}] }
```

Removing the Private Gateway allows the VPC to start again.  


### versions

Cloudstack 4.21.0

### The steps to reproduce the bug

I'm assuming this is due to the number of network tiers since a VPC with only a single tier is fine.


### What to do about it?

_No response_

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Private Gateway prevents VPC from starting (4.21.0) #11965

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Private Gateway prevents VPC from starting (4.21.0) #11965

Description

problem

versions

The steps to reproduce the bug

What to do about it?

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