Since last Thursday my remote desktop has suddenly stopped working. After about 5mths of perfect service. 
Our office has 3 PC's 2x Vista ultimate and 1x xp pro.
Our remote office/PC has 1x xp pro machine.
The remote PC can connect to the xp Pro machince at our office. Both Vista PC's can also remotely control the XP machine inside the office.
Problem is the remote PC can not connect to either of the vista machines, (which it needs too), nor can the vista machines remotely control each other.
I've checked the port forwarding and nothing has changed. Remote desktop is allowed via firewall.
Any ideas?

Our office has 3 PC's 2x Vista ultimate and 1x xp pro.
Our remote office/PC has 1x xp pro machine.
The remote PC can connect to the xp Pro machince at our office. Both Vista PC's can also remotely control the XP machine inside the office.
Problem is the remote PC can not connect to either of the vista machines, (which it needs too), nor can the vista machines remotely control each other.
I've checked the port forwarding and nothing has changed. Remote desktop is allowed via firewall.
Any ideas?