General SQL error -- Win32 error 10054

I've been getting this message connecting to the back-end:
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General SQL error.  Unable to complete network request to host "mda_nt".
Error reading data from the connection.  Unknown Win32 error 10054.
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What does this mean?  Is this a network problem? It's becoming a major pain...
Where can I look these errors up?

Many thanks,
  Norman Lange