Can't connect via Screen Share or Web Server, but can ping and ssh

Bit of an odd problem here.
My Mountain Lion Mac Pro (called "Trogdor" for convenience) is connected to my work university network. I can ping it from anywhere-- elsewhere on the network, from home behind a firewall. Can connect over ssh from everywhere. I can also connect to other computers (on the same network or at home behind a firewall) from Trogdor via ssh, Screen Sharing, etc.
But I can't Screen Share into Trogdor, and I can't connect to Trogdor's built-in web server, either system-wide (in /Library/WebServer) or for my username (~/Sites). (I can connect to the web server from Trogdor.)
Note that I can do both of these for other computers on the same network (same subnet, etc), so it's not a network issue. I can't do these from anywhere: same network or from home. I have this problem whether I use Trogdor's hostname or its IP address. (I can look up its hostname using the IP address with the "host" tool in Terminal, and vice versa.)
So it sounds like a port issue, right? Except I don't think I've ever messed with my port settings directly. How do I diagnose the problem? Should I scan my ports? Can I return port settings to default?
Thanks!
Message was edited by: supercres

Bit of an odd problem here.
My Mountain Lion Mac Pro (called "Trogdor" for convenience) is connected to my work university network. I can ping it from anywhere-- elsewhere on the network, from home behind a firewall. Can connect over ssh from everywhere. I can also connect to other computers (on the same network or at home behind a firewall) from Trogdor via ssh, Screen Sharing, etc.
But I can't Screen Share into Trogdor, and I can't connect to Trogdor's built-in web server, either system-wide (in /Library/WebServer) or for my username (~/Sites). (I can connect to the web server from Trogdor.)
Note that I can do both of these for other computers on the same network (same subnet, etc), so it's not a network issue. I can't do these from anywhere: same network or from home. I have this problem whether I use Trogdor's hostname or its IP address. (I can look up its hostname using the IP address with the "host" tool in Terminal, and vice versa.)
So it sounds like a port issue, right? Except I don't think I've ever messed with my port settings directly. How do I diagnose the problem? Should I scan my ports? Can I return port settings to default?
Thanks!
Message was edited by: supercres

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