Event ID - 21

Event Id21
SourceSNA Server
Description(1124) Negative Response Sent on Connection [Connection Name] (SENSE = 814)
Event InformationWhen a user attempts to run an AS/400 or mainframe print job by using the Host Integration Server 2000 Print Server, the job may fail to print, and this event may appear in the Application event log.
CAUSE: Although Event ID 15 includes an error returned code of 1722, which means "the RPC Server is unavailable," this problem may be related to security and printer access. The SnaPrint Service user account may not have access to the network printer. To test this, log on with the SnaPrint credentials, and then attempt to print from Notepad. If the print job fails to print, troubleshoot this problem as a resource access issue.
For this particular issue, the Host Integration Server is located in one Windows NT Server or Windows 2000 domain, while the printer is located in another Windows NT Server or Windows 2000 domain. These two domains are separate, with no trust relationship setup.
RESOLUTION: To resolve this problem, do one of the following:
Add the user ID and password that the SnaPrint Service runs under to the domain where the printer resides.
Set up a trust relationship between the two domains.
Set up the printer to use LPR (Standard TCP/IP Port). When you use an LPR printer, the print job is sent directly to the printer not passing any security credentials.
Reference Links Events 15 and 21 Are Logged When You Use Host Integration Server 2000 Print Serverv

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