Adjusting PPTP KeepAlive Frequency (193841)
The information in this article applies to:
- Microsoft Windows NT Server, Enterprise Edition 4.0
- Microsoft Windows NT Workstation 4.0
- Microsoft Windows NT Server 4.0
This article was previously published under Q193841
IMPORTANT: This article contains information about editing the registry.
Before you edit the registry, make sure you understand how to restore it if
a problem occurs. For information on how to do this, view the "Restoring
the Registry" online Help topic in Regedit.exe or the "Restoring a Registry
Key" online Help topic in Regedt32.exe.
SUMMARY
Some ISDN Connected Clients/Networks that use PPTP may notice high costs
associated with continuos ISDN link caused by the idle inactivity timer
never expiring. This PPTP keepalive packet can be controlled to reduce the
frequency of this test so that it is greater than the idle inactivity
timeout value. PPTP, by default, sends "keepalive" packet every 60 seconds
to verify the tunnel. This frequency can be adjusted by altering the
registry.
REFERENCES
For additional information, please see the following article in the
Microsoft Knowledge Base:
164601
How to Enable PPTP Port for Network Monitor
181431
How Windows NT RAS Handles Auto Disconnect
Modification Type: | Major | Last Reviewed: | 8/9/2001 |
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Keywords: | kbinfo kbnetwork KB193841 |
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