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Slow RAS connection

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by mteal

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I have two remote users who are consistently connecting at only 14kbps to a RAS server. Both are laptop users. One laptop runs NT 4 workstation and the other runs Windows 95 (Rev A). Both laptop modems are 56k and the users can connect to their own ISPs at close to 56k (44,000 bps is about the minimum).

The RAS server is running NT 4 server, service pack 6A. Connected to it is an 8 port stallion board. There are 8 external 56k modems attached to it. The server has routing and remote access service set up and doesn't give any errors or messages in the event log. In Control Panel / Modems I have checked the modem setups and they appear correct and have ticked the logging box in this same location.

Any suggestions would be appreciated.being the Christmas break the users are out of contact for a little while, so it'd be a great relief to have some solutions for them before they next fly out.

5 replies

by dheupel

Stray electrical noise from all the other modems, and your server farm (or some other source) might be causing a line noise problem. Place RF chokes (found at any Radio Shack store for a couple bucks each) on each phone line just before it reaches the modem, and also place RF chokes on the serial cables, just before they get plugged into the Stallion's pigtail box or octopus cable.

You may also want the phone company to come in and run a noise test on your phone lines - they might be inherently noisy.

Also, how much horsepower has your NT server got? Is it an older 486/586 machine, or is it a relatively newer Pentium (II or III) class server? I'm not real familiar with the Stallion board, but you may want to double-check all the settings for that component. Also, (because my knowledge of the Stallion board is very limited) you might want to check for the individual COM ports that *may* (?) be created by the Stallion board, and make sure they are all opening at least at 57600bps.

Good luck!

by mteal

David,

Thank you for your suggestions.

I should have pointed out that there are about 10-12 other RAS users not having problems with their conenction speeds.

I believe this suggests problems with these users' DUN settings. However, they both connect to other ISPs okay and their DUN settings, from what they've told me, seem ok.

by dheupel

Are these RAS users' PCs using TCP/IP protocol once they connect to your RAS server? If so, then you may need to perform a registry edit on their notebooks to increase the TCP Default Receive Window (aka RWIN) value. You can get some information on this registry setting, and even download automatic registry tweaks from the following web site:

http://www.dslreports.com/tweaks/windows

NOTE: the above URL should have no spaces.

Good luck!

by mteal

Thanks for your suggestions. The users are using TCP/IP. I have tried that reigistry tweak, but still get the same speed. Their ISP connection is still okay as well.

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