LPD problem

We have an application which sends labels to HP and Zebra printers. Command is like that:

send \\printserver hp
send \\printserver zebra

The problem is that, sometimes we cannot get prints from Zebra but HP prints. On print server nothing seems. I checked logs and saw that Hp has printed but no information about Zebra, no error no information etc. It looks like printing job is being lost during sending! How can solve this?
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Make sure the Zebra printers do, in fact, use LPR ports rather than Standard TCP/IP ports.

Some of these kinds of printers use either LPR or proprietary port monitors that are installed along with the drivers.

TAI-Author Commented:
Let me check...
TAI-Author Commented:
I have found the problem.

All I need was "UseNonRFCSourcePorts" key.

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Windows Server 2008

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