DOCUMENT:Q136151 07-SEP-2001 [winnt] TITLE :SFM Print Service is Limited to 127 Printers PRODUCT :Microsoft Windows NT PROD/VER:winnt:3.51,4.0 OPER/SYS: KEYWORDS:kbprint kbPrinting ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Server versions 3.51, 4.0 ------------------------------------------------------------------------------- SYMPTOMS ======== Macintosh clients cannot print to printers shared by Windows NT Services for Macintosh (SFM) print servers. The following error message appears on the Macintosh client: A communication error has occurred. The following error is logged in the event log on the Windows NT SFM Server: Macprint Event ID 2019 - Semaphore timeout. Macintosh clients may also be unable to see the shared SFM printers. Also, you may receive the following event ID: Event ID 10022 This can occur when more than 127 AppleTalk-connected printers are configured as target printers regardless if the Windows NT Appletalk printers are being accessed by Macintosh clients. When this occurs, print jobs queued to the AppleTalk printers are stalled. CAUSE ===== This problem is caused by an AppleTalk Printer Access Protocol (PAP) limitation. In response to a connection request from a Macintosh client, Windows NT sends the socket on which the client can respond. When there are more than 127 printers shared on a Windows SFM server, Windows NT will exhaust the range of available sockets on the first node, and then move to the next node (a node is a set of sockets.) But there is no provision in the protocol to tell the client which node to use. The client continues to use the first node, but uses the new socket. That pair corresponds to some other printer, which drops the request and causes the errors. This is a limitation in Apple's design of Appletalk. WORKAROUND ========== A workaround exists that involves creating a service account specifically for Print Services for Macintosh and then denying that account access to certain printers using the Control Panel Printers tool. This will disallow Print Services for Macintosh access to share specified printers for Macintosh clients only. To accomplish this, perform the following steps: 1. On the Windows NT SFM server, create an account in User Manager to use as a service account for Print Services for Macintosh. Click to clear the "User must change password at next logon" checkbox and select the Password never expires checkbox. Specify a desired password. 2. Start the Control Panel Services tool. Click Startup for Print Services for Macintosh. Click This account and specify the macprint account and password information created in Step 1. 3. Start the Control Panel Printers tool. Right-click on the printer(s) that SFM should not share. Click Properties, and then click the Security tab. Click Permissions, and then select No Access for the macprint account. Additional query words: MAC sfmprint ====================================================================== Keywords : kbprint kbPrinting Technology : kbWinNTsearch kbWinNT351search kbWinNT400search kbWinNTSsearch kbWinNTS400search kbWinNTS400 kbWinNTS351 kbWinNTS351search Version : winnt:3.51,4.0 Issue type : kbprb ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2001.