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Sync of large archives in SAP NetWeaver Developer Studio fails (maybe only sporadically). A message “CommunicationException: IO Error while communicating with server." or something similar is displayed.


  1. Check whether you can accesses CBS through low-bandwidth network.
    Your PC might be permanently under very high load (e.g. happens sometimes on night-make servers when at the same time large builds are running)
  2. Check the "ServletsLongDataTransferTimeout" property of the J2EE Engine in the Visual Admin > Server > HTTP Provider > Properties.
    If the value is set too low, e.g. 10000 (10 seconds), increase it to for example 300000 (5 minutes).
  3. Restart the J2EE Engine.