Another server running on this port or An existing connection was forcibly closed by the remote host

[niemtin6789]

when i deploy to win server i see error
"Another server running on this port?\n%s..." % content[:512]) Exception: Could not read Browsermob-Proxy json Another server running on this port?"
or "An existing connection was forcibly closed by the remote host"

please help me how to resolve this issues.

thanks