Error message is coming from RPC::PIClient , so I backup this module and put some debug statement at failure point ..this is what i got.. 
 $comm->Write($socket, [$app, $version, $user, $password]);
    print "write: $!\n";
    $self->Debug("Waiting for server's response ...");
    my $reply = $comm->Read($socket);
    print "read: $!\n";

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output: 
write: Inappropriate I/O control operation
read:

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In reply to Re^5: DBI connect is failing with Perl v5.16.3 by prashantktyagi
in thread DBI connect is failing with Perl v5.16.3 by prashantktyagi

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