I've changed the listening port on IIS to
4016, and getting an odd problem.
Whenever I try to browse to the server with a web browser, I am now getting a "503 Service Unavailable" error.
But I do get it if I use the IP address of the server (i.e. http://192.168.246.20:4016 displays the error), either from another PC on the network or the server itself. This is the IP address of the server.
I also don't get the error in either case, if I have IIS listen on port 80.
I've allowed port 4016 on the firewall
I've checked the Application Pool is still running
I've checked the Event log (Windows Logs/Application or System), but no entry is displayed when this error is thrown.
I've checked the Access log and enabled the Failed Request Tracing but again, no entry is displayed for the error in either.
I've made sure that IIS is the only thing listening on Port 4016 (using
netstat, and also if I stop IIS, the attempt to browse times out)
I've tried disabling the firewall to ensure that's not the issue, but with the same result.
I tried with another port (40163) and it works fine! Unfortunately for my purposes it has to be port 4016. Is there a way of checking why a particular port would be causing a problem?