Network port for docker

[jrb5665]

Hi,
I have installed the docker container under a VM in proxmox.
If I run it with port 12101 I can connect to the web interface but if I specify something else, in this case 13101, it can't connect. If I then stop it and specify 12101 again it is OK.

Netstat shows the following when I change to 13101

sudo netstat -aop | grep 13101
tcp6 0 0 [::]:13101 [::]:* LISTEN 14561/docker-proxy off (0.00/0/0)

and this for port 12101
sudo netstat -aop | grep 12101
tcp6 0 0 [::]:12101 [::]:* LISTEN 14032/docker-proxy off (0.00/0/0)

[jrb5665]

Don't worry, I'm learning new things all the time.
I need to map the port when I start the docker containr using -p 13101:12101