Hi, Thanks for your reply. I have done some further analysis, which isn't entirely conclusive however I really don't believe there is a firewall problem. Some key facts: * I can connect to the same servers using JDBC or Sybase command line tools (isql). This demonstrates that there is no network issue between my machine and the Sybase server * I can connect to Sybase 15.7 instances using Toad. The instances I cannot connect to are all Sybase 15.0.3. Are there any known issues connecting to Sybase ASE 15.0.3? Thanks, Robert
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