Unknown error isn't very useful, but the error still has a number. To get the error number (which you can later look up on msdn) use int (as in int($!)  int($^E)). 
C:\>perl -e"$!=122;warn $!; $!=333;warn $!; die int $!"
Unknown error at -e line 1.
Unknown error at -e line 1.
333 at -e line 1.

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In reply to Re^2: Network Programming With Perl example 1 by PodMaster
in thread Network Programming With Perl example 1 by Anonymous Monk

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