Ghost 2003 - Peer to Peer, TCP/IP Sending Data Failed

I am ghosting several PC's over a network but am having problmes with 2 of them. When i try to connect to my ghost server from both these PC's I get the following error message:

 

TCP/IP Sending Data Failed.

 

I have done it on about 20 other computers (exact same model PC) already without a problem but cannot figure out whats wrong with either of these. 

 

Can anyone help me???