Spawn-fcgi on WSL Permission denied

[josephusmv]

I think many people may asked similar quests, this TCP Permission denied, that UDP Permission denied and so on. But I still wish to submit a new one, since I did not found anyone a refered to Spawn-fcgi and you guys never try to solve this issue, NEVER!

My server application is based on Spawn-fcgi to start up, but got permission denied when I try to start it from WSL. Nginx on WSL works fine on port 80, and I could access localhost:80 through browser. But I need to open sever port(9000~9005) through Spawn-fcgi, and do a reverse proxing through 81 port.

I tried closing firewall, add incoming rules, but found no help. Certainly, running as administrator and sudo not helps at all.

I believe the poor network implementation of WSL is THE reason for many people still using VM professional SW like virtual box and vmware.

WSL is really a wonderful tool, I wish I could love it and using WSL to replace those heavy SW's . but it will definitely fail if those huge amounts of networking issues is not solved.

WSL is installed from MS market place.
Ubuntu-20.04