When Ubuntu server – legacy kernel.
When i open mopidy and Logitech media server ports 9000 and 6680 should be open.

But only port 22 is open. 

I use orange pi plus. 

 

I have not had that problem with any other os on raspberry pi or orange pi 

I am not sure if this problem is specific to Armbian nor Orangepi. Moving to Peer to Peer section.

As Igor noted this is hardly has anything to do with Armbian specifically. This is more Linux specific (and if you did not have any problems on other custom images does not really mean anything) most linux systems would come by default with apparmor (in case of Ubuntu) or selinux (in case of RHEL based systems) and iptables. Either of those may prevent you from getting your ports accessed. iptables would block port access on linux kernel level (namely tcp/ip stack) and apparmor/selinux would not allow application to obtain the port unless explicitly permitted (not sure about apparmor as never used it really).

 

As there is not much info in your post you would either check if those are installed/enabled and give this info here and perhaps also check on https://unix.stackexchange.com/ which is more relevant place for troubleshooting this IMO.