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after further testing with WinSCP on the client i am pretty sure that it's a Net::FTPSSL issue, as i can get the WinSCP client to conenct properly.
After testing with WinSCP i uninstalled the perl install (strawberry perl) and re-installed. I now get the following output in my log:
Net-FTPSSL Version: 0.22
Perl: 5.016001 5.16.1, OS: MSWin32
Server (port): xxxx.xxx.xxx (21)
Keys: (Debug), (Encryption), (Port)
Values: (1), (I), (21)
Cannot connect to xxxx.xxxx.xxx: SSL connect attempt failed with unknown error error:1408F10B:SSL routines:SSL3_GET_RECORD:wrong version number at rbc_ftp.pl line 63.
Some more google searching regarding this new error message hasn't brought me much in the way of a solution....
Does anybody have any ideas on how to fix this? I am at a loss for why this keeps failing, even though on other clients this script works just fine (including another windows 2008 r2 machine).