I have been trying Windows Containers on windows server 2016 TP5. Suddenly I started getting error while running a container with port maping option -p 80:80
c:\>docker run -it -p 80:80 microsoft/iis cmd
docker: Error response from daemon: failed to create endpoint sharp_brahmagupta on network nat: HNS failed with error : Failed to create endpoint.
I made sure that no other container is running and port 80 on host machine is not being used by any other service.
Did anyone face same issue?
After searching around I stunbled upon this issue on github. This seemed to be a known issue with Windows containers on Windows server TP5.
Then thanks to this forum, I found the solution You can check active static port mapping with below command
C:\>powershell
PS C:\>Get-NetNatStaticMapping
StaticMappingID : 3
NatName : Hda6caca4-06ec-4251-8a98-1fe0b4c5af88
Protocol : TCP
RemoteExternalIPAddressPrefix : 0.0.0.0/0
ExternalIPAddress : 0.0.0.0
ExternalPort : 80
InternalIPAddress : 172.31.181.4
InternalPort : 80
InternalRoutingDomainId : {00000000-0000-0000-0000-000000000000}
Active : True
From above output it seemed that even though container was removed the static port mapping was not removed and was still active.
But I removed it with below command.
PS C:\> Get-NetNatStaticMapping | ? ExternalPort -eq 80 | Remove-NetNatStaticMapping
Then simply rebooted the system and the error was gone.