DOCUMENT:Q249816 13-JUN-2001 [sna] TITLE :APPC App Fails with Primary RC = F004, Secondary RC = 00000000 PRODUCT :Microsoft SNA Server PROD/VER:WINDOWS:3.0 (all SP),4.0,4.0 SP1,4.0 SP2,4.0 SP3 OPER/SYS: KEYWORDS: ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft SNA Server, versions 3.0 SP1, 3.0 SP2, 3.0 SP3, 3.0 SP4, 4.0, 4.0 SP1, 4.0 SP2, 4.0 SP3 ------------------------------------------------------------------------------- SYMPTOMS ======== On the TP_STARTED call, an APPC application may fail and the following error message may occur: Primary Return Code = F004 (AP_COMM_SUBSYSTEM_NOT_LOADED) Secondary Return Code = 00000000 (no applicable subcode) The APPC Programmer's Guide in the online SDK documentation describes the F004 error as follows: A required component could not be loaded or has terminated while processing the verb. Thus, communication could not take place. Contact the system administrator for corrective action. CAUSE ===== This error can be caused by the application calling an incorrect version of the Wappc32.dll file. This file is installed with SNA Server in the Sna\System directory. RESOLUTION ========== If there is a duplicate Wappc32.dll file on the computer in the \WINNT\System32 directory for example, delete or rename it. MORE INFORMATION ================ In one customer instance, there were two versions of the Wappc32.dll file on the system because the IBM version was installed in the \WINNT\System32 directory when the customer installed the IBM emulator program. Note: There are other issues that can cause the F004 error with different secondary return codes. For additional information, click the article numbers below to view the articles in the Microsoft Knowledge Base: Q148359 SNA Server APPC Error: F004 AP_COMM_SUBSYSTEM_NOT_LOADED Q150841 Troubleshooting Common APPC Error Codes The third-party products discussed in this article are manufactured by vendors independent of Microsoft; we make no warranty, implied or otherwise, regarding these products' performance or reliability. Additional query words: ====================================================================== Keywords : Technology : kbAudDeveloper kbSNAServSearch kbSNAServ400 kbSNAServ300SP3 kbSNAServ300SP1 kbSNAServ400SP1 kbSNAServ400SP2 kbSNAServ400SP3 kbSNAServ300SP2 kbSNAServ300SP4 Version : WINDOWS:3.0 (all SP),4.0,4.0 SP1,4.0 SP2,4.0 SP3 ============================================================================= 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.