I have posted some of this story already but I wanted to repost as the situation now seems to focus a little differently.
I have 3 computers. Lets call them home, work and server.
When connecting through ssh I can connect:
- from home to server
- from server to work
- from home to server to work
but when I try to connect from home to work I get:
Turns out I cannot connect directly from home to work at all. VNC for example also fails.
ssh: connect to host ems4.rrc.uic.edu port 22: Connection refused
So we check the ports.
From home to work I get:
though from server (or home to server) to work I get:
Starting Nmap 4.53 ( http://insecure.org ) at 2008-06-24 21:48 CDT
All 1714 scanned ports on work.workserver.com (***.***.***.***) are closed
Nmap done: 1 IP address (1 host up) scanned in 0.235 seconds
As per a suggestion I have made sure that all the netmasks are correct.
Starting Nmap 4.53 ( http://insecure.org ) at 2008-06-24 21:51 CDT
Interesting ports on work.workserver.com (***.***.***.***):
Not shown: 1707 closed ports
PORT STATE SERVICE
22/tcp open ssh
111/tcp open rpcbind
113/tcp open auth
631/tcp open ipp
1234/tcp open hotline
5900/tcp open vnc
8000/tcp open http-alt
Nmap done: 1 IP address (1 host up) scanned in 0.129 seconds
Also I have tried using home (a laptop) from another physical location with another ip address. Still nothing.
This leads me to believe that somehow one or the other computer is actively blocking the other.
What configuration files or blacklists can prevent nmap from finding open ports?
Thanks for any help!