Multilink ISDN in Windows NT 4.0 May Fail When Connecting On 2nd Channel

ID: Q169136

The information in this article applies to:

Microsoft Windows NT Server version 4.0
Microsoft Windows NT Workstation version 4.0

SUMMARY

When you try to establish a multilink connection (using multiple ISDN channels) to a Livingston Portmaster using Windows NT 4.0 Dial-Up Networking, the second channel may fail to connect and display the following error:

Error 721 remote PPP server is not responding

Also, in some cases the connection may drop with no errors.

However Windows 95 may connect both channels successfully.

CAUSE

This is caused by a limitation in certain versions of the firmware on the Livingston Portmaster, which do not allow simultaneous connections within 500 milliseconds of one another.

The reason Windows 95 clients can connect to the Livingston Portmaster and Windows NT clients fail is because Windows NT 4.0 tries to connect both channels simultaneously. Windows 95 establishes the connection on the first channel then dials the second channel.

RESOLUTION

To resolve this issue, update the code on the Livingston Portmaster to the latest version, which can be found at Livingston's website:

http://www.livingston.com

Or contact Livingston Technical Support at 1-800-458-9966 or 510-426-0770.

Additional query words: mulitlink multi-link ras ml

Keywords : kb3rdparty kbnetwork ntras NTSrvWkst
Version : WinNT:4.0
Platform : winnt
Issue type :