DOCUMENT:Q138159 28-JUL-2001 [win95x] TITLE :16-Bit MS-DOS-Based Communications Program May Not Work PRODUCT :Microsoft Windows 95.x Retail Product PROD/VER:95 OPER/SYS: KEYWORDS:dun win95 kbDialUp ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows 95 ------------------------------------------------------------------------------- SYMPTOMS ======== When you try to use a 16-bit MS-DOS-based communications program in an MS-DOS session in Windows 95, the modem may not be initialized properly. When this occurs, you may receive an error message stating that the communications port is in use, not found, or unable to initialize. In some cases, no error message is displayed, but you cannot use the modem in the 16-bit communications program. CAUSE ===== This behavior can occur if Dial-Up Networking Server is monitoring the line, if your fax modem is set to receive faxes automatically, or if the modem is using the wrong IRQ or I/O address for the COM port. RESOLUTION ========== To resolve this issue, add the following setting to the [386Enh] section of the System.ini file COMAutoAssign=2 where is the port your modem is assigned to. For example: COM2AutoAssign=2 If the "COMAutoAssign=2" setting does not work, close all programs that are monitoring the communications port (such as Dial-Up Networking Server and Microsoft Fax), and then use one of the following methods: - Disable caller access to Dial-Up Networking Server. To do so, follow these steps: 1. Click the Start button, point to Programs, point to Accessories, and then click Dial-Up Networking. 2. Click Connections, and then click Dial-Up Server. 3. Click No Caller Access, and then click OK. - Disable the automatic receiving of faxes. To do so, follow these steps: 1. Use the right mouse button to click Inbox on the desktop, and then click Properties on the menu that appears. 2. Click Microsoft Fax, and then click Properties. 3. Click Modem, click the modem you are using, and then click Properties. 4. Click Don't Answer, and then click OK until you return to the desktop. For additional information about using the "COMAutoAssign=" setting, please see the following article in the Microsoft Knowledge Base: Q130402 Device Contention in Windows Also, verify that the modem is using the correct IRQ and I/O address settings for the COM port it is using. Additional query words: comxautoassign ====================================================================== Keywords : dun win95 kbDialUp Technology : kbWin95search kbZNotKeyword3 Version : 95 ============================================================================= 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.