Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
?
Solved

ISA 2004  VPN   error 651 client connect

Posted on 2008-10-31
3
Medium Priority
?
756 Views
Last Modified: 2012-05-05
Running ISA 2004 with sp3 on server 2000, sp4.

VPN was working fine.

Suddenly, all outside clients get an "error 651...modem error" when trying to connect using the same connection string they were always using.

I tried disabling/enabling VPN in ISA2004 and rebooting, but that did nothing.

Any ideas would be GREATLY appreciated.

Thanks.
0
Comment
Question by:gateguard
  • 3
3 Comments
 

Accepted Solution

by:
gateguard earned 0 total points
ID: 22852528
I found the problem.  It actually had nothing to do with my POP3 server rule.  A few days ago I set up a secure ftp server using a custom protocol and I misunderstood something I read about secure ftp wanting to have access to a large number of upper-range ports for random connections (or something like that) and I added a wide range of ports in my user-defined protocol.  Much too wide a range.  When I finally got around to doing a netstat -an and saw all the ports my machine was listening on, it clued me in to the problem.

So I deleted that rule, and that protocol and now everything is working.

I think the server was just bogged down with too much darn listening.
0
 

Author Comment

by:gateguard
ID: 22852540
I meant to say it had nothing to do with the VPN setup, which was fine.  (I was also having POP3 mail server problems, also caused by the same thing.)
0
 

Author Comment

by:gateguard
ID: 22852549
The listening-on-too-many ports broke my VPN, broke my POP3 mail server, and caused general flakiness all around.  Including a bunch of 14198 no-socket errors in the event log which would freeze the whole server.  Now everything is fixed.
0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

There are three types of ISA client that can be configured - these can be individual clients or multiples of a client on each PC or server SecureNAT. A SecureNAT client for ISA server is a client machine, work station or server, that has its defa…
In all versions of ISA Server and the current version of FTMG, the default https protocol uses TCP port 443 and 563 only. This cannot be changed within the ISA or FTMG GUI and must be completed from a Windows cmd prompt on the ISA Server itself. …
Look below the covers at a subform control , and the form that is inside it. Explore properties and see how easy it is to aggregate, get statistics, and synchronize results for your data. A Microsoft Access subform is used to show relevant calcul…
Whether it be Exchange Server Crash Issues, Dirty Shutdown Errors or Failed to mount error, Stellar Phoenix Mailbox Exchange Recovery has always got your back. With the help of its easy to understand user interface and 3 simple steps recovery proced…

564 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question