[SOLVED] An app having trouble binding ports when installed on host

[disk2]

I'm trying to get coolercontrold up on my PVE instance. When installed on host and initialized, logs output:
IPv4 bind error: Could not bind to standard IPv4 loopback address on port 11987
Is there any sort of firewalling measure on PVE that could potentially cause this?

 

[MarkusKo]

bind errors are mostly because the port is already in use by something else
try

lsof -i

in the shell to see if the port ist already used

 

[disk2]

Big thanks! I'm an idiot apparently!