What protocol are you using to communicate? If it's TCP/IP, can you ping the server by name from the client? How about ping the client by name from the server? Do other clients have the same problem? If not, what different about those? What flavor of XP are you using (Home, Pro, Tablet, MCE, etc)?
The 3105 means:
No available transport protocol for the Pervasive Network Services Layer
No transport protocol that is common to both the target server engine and clients is available. For example, this status code could be caused by a client using SPX when the server engine only has TCP/IP available. Check the Supported protocols setting within the Communication protocols option for both the client and server. For more information on Communication protocols, refer to Advanced Operations Guide.
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