I am in the process of testing your replication suite and I encountered a problem with the ib_repl.so. My configuration is the following : Source Side : Windows XP SP2, Firebird2, ibreplicator_2.0.build_16.1.win.exe Target Side : Kubuntu, Firebird2 (with 'UdfAccress = Restrict UDF;' in conf file) On the Windows side everything works ok but whatever I do I get an error each time I try to create the system objects on the target side : First I copied the ib_repl.so provided in ibreplicator_2.0.build_16.1.win.exe on the Linux side in firebird2/UDF. I get the error : Access to UDF library "libib_repl.so" is denied by server administrator. If I rename 'ib_repl.so' to 'libib_repl.so' I get this error: invalid request BLR at offset 417 function REPL$BLOB_TO_TIMESTAMP is not defined module name or entrypoint could not be found. Then I copied the ib_repl.so provided in ibreplicator_2.0.build_10.1.i386.tar.gz on the Linux side in firebird2/UDF. I get the error : Access to UDF library "libib_repl.so" is denied by server administrator. If I rename 'ib_repl.so' to 'libib_repl.so' I get this error: invalid request BLR at offset 417 function REPL$BLOB_TO_TIMESTAMP is not defined module name or entrypoint could not be found. So finally I compiled my own ib_repl.so from the sources provided in ibreplicator_2.0.build_10.1.i386.tar.gz. I get a slightly different error : invalid request BLR at offset 559 function REPL$STRING_COPY is not defined module name or entrypoint could not be found. Any suggestions ?