(Windows 10) PuTTY - something blocks port tunnel

Question

I'm stuck. I don't know why the port tunnel doesn't work on Windows with PuTTY.

I have established ssh connection with the following port forwarding: 8000:localhost:80. On the remote host i have got UI interface exposed on port 80. Everything was working fine to the some moment. Currently the tunnel is established (ssh session works too) but i cannot see the UI. The request for localhost:8000 is pending all the time.

Everything works on Linux fine (with ssh -L 8000:localhost:80). Disable of windows firewall seems doesn't work. If you have any ideas please share. Thank you.

EDIT:

Pending request: https://prnt.sc/fbycpd

Putty port tunnel config: https://prnt.sc/fbyda3 (Fake IP)

Answer 1

Your screenshot doesn't match the information in your post. You say that you have configured the server's localhost as the tunnel's destination, but your PuTTY screenshot lists 111.111.111.111. Whether it's literally that address or some other global address – even if it's the server's own address – it's still not the same thing as localhost.

It is possible for a program to only listen for connections on a specific local address – so in your case it's very likely that the app on your server is listening on loopback addresses only.