MSDLC Hangs Computers Running Processor Speeds Over 66 MHz

• Microsoft Windows for Workgroups version 3.11
• Microsoft Windows operating system version 3.1
• Microsoft LAN Manager version 2.2
• Microsoft Windows 95

SYMPTOMS

When you attempt to load MSDLC.EXE in Windows or Windows for Workgroups with computer processors running at speeds greater than 66 MHz and initiate the host session, Microsoft Data Link Control (MSDLC) either does not respond to host commands or the processor stops responding (hangs) forcing a system reboot. MSDLC.EXE loads fine from MS-DOS.

CAUSE

The timer routine is not set properly for Pentium processors resulting in unnecessary network traffic. In addition, a FRMR routine ran due to the high network traffic. This is not appropriate for the Class II, CCB II protocol in the DLC stack. This causes the system to hang.

STATUS

Microsoft has confirmed this to be a problem in MSDLC. A fix to this problem for Microsoft LAN Manager version 2.2 and Microsoft Windows for Workgroups version 3.11 is in development, but has not been regression- tested and may be destabilizing in production environments. Microsoft does not recommend implementing this fix at this time. Contact Microsoft Product Support Services for more information on the availability of this fix.