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You might want to check the documentation for DBI::ProxyServer--specifically the where it discusses the mode (--mode=modename) options. In summary, if you are using Perl 5.005 or higher compiled successfully for threads you can use the --mode=threads. If you don't have threads but have a working fork(), use --mode=fork. If neither of the above is true you can try using --mode=single, but will be limited to a single connection. Also, IIRC the dbiproxy should be running on an NT/2K/XP class computer (if you're using Windows).