Remote Desktop Disconnected (error 50331656)

I have a home-based Windows 7 remote client that has been using Remote Web Workplace (RWW) to connect to his office Windows 7 client system through SBS2008 for several years without trouble. Suddenly, his remote connections are crashing with the error 50331656. He can maintain a remote connection anywhere from 3 to 25 minutes before crashing and can immediately reconnect after re-establishing the connection.

I have used another Windows 7 remote client to login to the same user account and connect to the same target Windows 7 client and can maintain a stable connection for at least 100+ minutes. This remote client has never had a remote connection failure.

The problem started right after the last set of Windows Updates from Microsoft on 3/11/15. But I have also uninstalled all of those new updates from the home-based client and the problem remains.

This is getting frustrating for both me and the user. Any ideas on cause are appreciated.
Joel RuthsTechnology ConsultantAsked:
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JohnBusiness Consultant (Owner)Commented:
Set up a new, test Windows User Account (User Profile). Log in to the new profile and test Remote Desktop in the new profile. It could be a damaged profile.

Try scanning for viruses with your own application and then Malwarebytes.

Try running System File Checker. Run SFC /SCANNOW and allow to complete. Restart and test to see if SFC repaired the issues.
VB ITSSpecialist ConsultantCommented:
Have a look at the solution in a previous question posted on EE:

Although the symptoms aren't exactly the same, I have seen reports of that particular registry fix resolving the issue for a number of other people.
Joel RuthsTechnology ConsultantAuthor Commented:
@ John Hurst - Thanks for your fast response! Setup a new user account profile, scanned system with Vipre & MBAM, and ran SFC /SCANNOW. All scans were clean. No change in connection failure with new profile.

Any other ideas?
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Joel RuthsTechnology ConsultantAuthor Commented:
@ VB_ITS - Thanks for responding with your suggestion. The certificate entries to be deleted from the Parameters registry key do not exist.  So they cannot be deleted.

Any other ideas?
JohnBusiness Consultant (Owner)Commented:
If the scans, System File Checker and new User Profile did not solve the problem, then you need to run Windows 7 Repair Install. For this, you need a working recovery partition or the Windows 7 DVD. Here is a Seven Forums tutorial to assist you with this.

If you prefer and not a lot more time, back up, format and reinstall Windows 7.
Joel RuthsTechnology ConsultantAuthor Commented:
@ John Hurst - Thanks for the reinstall suggestion; I'll take that as a last resort. Do you think a slower connection for the Home system that is having problems could cause this error? The user has a DSL with 1Mbps download and 0.40Mbps upload speed.
JohnBusiness Consultant (Owner)Commented:
A slower connection should not be an issue. It could be a flaky connection, but such is often a gentle disconnect plus reconnect. You say another machine is fine.
Joel RuthsTechnology ConsultantAuthor Commented:
@ John Hurst - Yes but from a different network on a different ISP.
JohnBusiness Consultant (Owner)Commented:
If the user of the problem machine says their network is solid, then it is likely a machine issue as we noted earlier.

If the user says other machines have connection problems, then it could be the connection. Your description of the problem does not really match this.

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Joel RuthsTechnology ConsultantAuthor Commented:
@ John Hurst - Well, the problem has changed somewhat in that I had the user test the connection using another system which also fails after a period of time. This is new information provided by the user who originally stated that they were able to maintain a connection using another system. So, after wasting a lot of time, the user is upgrading their ISP service and replacing their modem router.  I fully expect this will rectify the problem.
Thank to both of you for your suggestions.
JohnBusiness Consultant (Owner)Commented:
@jruths - Thanks for the update and I was happy to help with this.
Joel RuthsTechnology ConsultantAuthor Commented:
I am re-opening this problem as it remains unresolved. I am having the end user again test his network connection with a different system and am waiting for those results. Since my previous posts, the end user did upgrade his Internet service and now has about 7Mbps down and 0.8Mbps up, as well as a new router/modem. I am waiting to be given administrative access to the router to check the settings.

The end-user is so frustrated wit this problem that he is ready to resign from his job because he does most of his work from home. So I have to get this issue identified and resolved.

I have again tested a RWW connection to the SBS2008-based target Windows 7 client using a different system on a different network and have no problem maintaining a long-term connection of at least 2.5 hours. So I believe the user account and RWW protocol is working correctly through the server.
JohnBusiness Consultant (Owner)Commented:
From the original problem:  "Suddenly, his remote connections are crashing with the error 50331656. ...  The problem started right after the last set of Windows Updates from Microsoft on 3/11/15. "

Is this now still true?  Still the same problem?  There were two complete Patch Tuesdays plus more off cycle updates from Microsoft in April. Is the machine up to date?

I have again tested ... a different system on a different network and have no problem ....  So I believe the user account and RWW protocol is working correctly through the server

Can you try a different machine with the user?  Or repair the problem machine (Windows 7 Repair Install) .  There is a Seven Forums Tutorial to assist you.
Joel RuthsTechnology ConsultantAuthor Commented:
I was just told by the user that he is being disconnected using a different system on the same network, so it is looking like it may be a router and/or ISP issue. I will check the router settings next.

Yes both systems on the problem network have all recent updates installed.
JohnBusiness Consultant (Owner)Commented:
If multiple systems fail on one network and all updated, then yes, it may be the router still and/or ISP
Joel RuthsTechnology ConsultantAuthor Commented:
Logged into the router remotely and found in the system logs that the router is renewing the IP address for the same device as often as every few minutes, even though the lease expiration time is set to 7 days. I went ahead and assigned reserved IPs for the 3 active computers on the network and restarted router to see if that stops the problem. I'll let you know what happens. Thanks for your continuing interest and suggestions.
JohnBusiness Consultant (Owner)Commented:
Please keep us informed. I am very happy to help.
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