DOCUMENT:Q174642 13-JUN-2001 [sna] TITLE :DCA ISCA SDLC Connections Fail On Pentium Pro Systems PRODUCT :Microsoft SNA Server PROD/VER:WINDOWS:2.11,2.11 SP1,2.11 SP2,3.0,3.0 SP1 OPER/SYS: KEYWORDS: ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft SNA Server, versions 2.11, 2.11 SP1, 2.11 SP2, 3.0, 3.0 SP1 ------------------------------------------------------------------------------- SYMPTOMS ======== A SNA Server using a DCA Intelligent Synchronous Communications Adapter (ISCA) SDLC adapter on a system with a Pentium or Pentium Pro processor (133Mhz or faster) and using a 56Kbps SDLC line may experience one or more of the following problems: - The SDLC connection stays in a "Pending" state after it is started. - The SDLC connection goes to an "Active" state and the 3270 LUs become "Available", but it can take a minute or more before all of the sessions are "Available". - If the SDLC connection is "Active" and the 3270 LUs are "Available", 3270 sessions experience very slow response times. Each screen update may take 30 seconds or more to complete. - The SDLC connection drops after it is "Active" causing a message similar to the following to be logged in the Windows NT Application Event Log: Event ID: 23 Source: DCA SDLC Link Service Description: Connection using Link Service DCASDLC1 failed. Qualifier = 0x'0015' Another symptom of this problem is that enabling SNA Server traces for the DCA SDLC Link Service and restarting the SNA Server service may correct the problems that were being experienced before enabling the traces. When tracing is enabled, the SDLC connection activates and the response times return to the level expected for a 56Kbps SDLC line. CAUSE ===== The cause of the problem is unknown. RESOLUTION ========== The DCA SDLC Link Service has been updated to correct the problems that have been reported when using the DCA ISCA SDLC adapter on systems with Pentium or Pentium Pro (133MHz or faster) processors. The updated driver can be used with SNA Server 2.11 and 3.0. The following steps may provide an interim solution until the updated driver can be obtained and applied to the SNA Server: 1. Start the SNA Server Trace program (snatrace.exe). 2. Select the DCA SDLC Link service (i.e. DcaSdlc1) as the component to trace. 3. Enable Full Internal Tracing, Data Link Control, and Level 2 Messages as the trace options. 4. Click Apply and close the SNA Server Trace Program. 5. Stop and Restart the SNA Server service. STATUS ====== Microsoft has confirmed this to be a problem in SNA Server versions 2.1, 2.11, 2.11 SP1, 2.11 SP2, 3.0, and 3.0 SP1. This problem was corrected in the latest SNA Server version 3.0 Service Pack. For information on obtaining this Service Pack, query on the following word in the Microsoft Knowledge Base (without the spaces): S E R V P A C K Additional query words: ====================================================================== Keywords : Technology : kbAudDeveloper kbSNAServSearch kbSNAServ300 kbSNAServ211 kbSNAServ211SP1 kbSNAServ211SP2 kbSNAServ300SP1 Version : WINDOWS:2.11,2.11 SP1,2.11 SP2,3.0,3.0 SP1 ============================================================================= 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.