This article was previously published under Q141708
Delays may result when you print to a Windows print server connected through line printer remote (LPR)to a shared printer using the Line Printer Daemon (LPD) service.
In Windows NT version 3.51 Service Pack 4 (SP4) and earlier, the LPRservice used TCP ports 721 through 731 for LPR connections. This compliedwith RFC 1179 but limited performance because it only enabled 11 TCP portsto be in use by the service at one time. Per RFC 1122, each port must notbe reused for four minutes (2 * Maximum Segment Lifetime as defined in RFC1122).
A change in Windows NT 3.51 SP5 and Windows NT 4.0 up to Service Pack 2(SP2) provides a performance enhancement for LPR printing. This enhancementenables TCP ports 512-1,023 to be used for outbound LPR connections butdeviates from RFC 1179 and therefore causes problems with someapplications.
To revert back to the RFC 1179 specification, use the steps listed in theappropriate section below.
Windows NT 3.51 SP5
To revert Windows NT 3.51 SP5 back to being RFC compliant, obtain thehotfix mentioned below or regress back to the SP4 files, by copying thefollowing files into your %Systemroot%\System32 folder:
(from the Windows NT 3.51 SP4 CD)
(from the original Windows NT 3.51 CD)
NOTE: It is necessary to restart the Spooler service for the changes totake affect. To stop the Spooler service, type the following command at anMS-DOS command prompt:
net stop spooler
To restart the Spooler service, type the following command at an MS-DOScommand prompt:
net start spooler
Windows NT 4.0 SP2 and Earlier
Windows NT 4.0 SP2 and earlier can become RFC compliant by applying thelatest service pack for Windows NT 4.0.
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in theMicrosoft Knowledge Base:
152734 How to Obtain the Latest Windows NT 4.0 Service Pack
Microsoft has confirmed that this is a problem in Windows NT 4.0 and Windows NT Server 4.0, Terminal Server Edition. This problem was first corrected in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4.
With Windows NT 4.0 Service Pack 3, the default TCP Ports for LPR are 721-731.Changes can also be made so that ports greater than 1,023 can be usedto prevent LPR from running out of available ports or conflicting withreserved ports.
For more information about available LPR port options with Service Pack 3,please see the following article in the Microsoft Knowledge Base:
ARTICLE-ID: 179156 TITLE : Updated TCP/IP Printing Options for Windows NT 4.0 SP3 and Later
For more information about changes to LPR in Windows NT 3.51, please seethe following article in the Microsoft Knowledge Base:
ARTICLE-ID: 153666 TITLE : Updated TCP/IP Printing Components for Windows NT 3.51