suddenly not connecting to remote machines

I'm running Debian/Testing on an AMD64 machine.

I follow what I believe is a fairly conventional way of connecting to 
remote machines. Firstly I establish an SSH tunnel using a command like:

   ssh <remote server public IP> -L 5902:<remote workstation local IP>:5900

where the remote server public IP is that of the router (DD-WRT) with 
port 22 forwarded to the local IP of a remote Debian/Stable server. The 
remote workstation IPs are in the 192.168.1.* range. The SSH connection 
works fine.

Then I connect to localhost:5902 using a VNC viewer (tried a few).  I've 
been doing this for a decade with no significant problems.

However I haven't been able to do this since at least yesterday 
(previous remote login was a week ago. It worked). No matter which 
remote machine I try to connect to, I never get to the password prompt. 
Instead the connection attempt eventually attempt times out.

I can log onto a KVM virtual machine running on the remote server using 
the Virtual Machine Manager GUI. From there I can connect to the other 
(real) machines using the Tight VNC viewer.

I'm stumped. The KVM service is clearly working on the remote 
workstations since I can connect to them from the virtual machine. Any 
ideas?



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