I came across something similar that may be your case. The iSeries used LPR/LPD in an environment with firewall. The firewall allowed for the LPD port, but was configured to reject "low ports" (< 1024) coming out of the iSeries.
For some strange reason the iSeries LPR client open port <1024 and did not make it, so I would recommend to try and recheck firewall configuration.
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This was first published in October 2003