HTTP 500 Internal Server Error every 40-50 days

We have had a problem with DocuWare since late 2018.  Every 40 to 50 days, our users will open the web client and get a HTTP 500 Internal Server Error.  The only fix is a server reboot.  I went through all the logs, and found these common errors on the dates we had the issues.

• AcceptSecurityContext failed. Error Code = 2148074248 > The token supplied to the function is invalid
• AcquireCredentialsHandle failed, Error: 2148074245 > The requested security package does not exist
• Cannot find active authentication server. All servers are either stopped or the communication channel settings don't allow a connection.
• Can not connect to the remote host "gtcp://<servername>:9000". System error message: No connection could be made because the target machine actively refused it 10.0.0.114:9000.
• Login token expired
• No suitable active server AuthenticationServer with guid 3a3486ec-725c-4806-95db-5d256d5da0b4 found. Server connections excluded (already tried to connect): 26263075-9716-400e-a654-9aea7fd9ff3b. Reason: Requested Service not found
• System.InvalidOperationException: Collection was modified; enumeration operation may not execute.
• System.NullReferenceException: Object reference not set to an instance of an object.
• The response has not been received within the specified period of time.

I looked at the dates when we had issues.

1. The first round of issues were on 9/10/18 followed by 10/10/18 and 10/22/18 – at that point DW installed HotFixPack24 and HotFix36 on 11/16/18. That seemed to fix our issues until 3/25/19.
2. The 2^nd round started on 3/25/19 followed by 5/3/19 – at that point DW installed HotFixPack40 on 5/11/19. That seemed to fix our issues until 9/20/19
3. The 3^rd and most recent round of issues started on 9/20/19, then 11/4/19, then 12/26/19, then 2/7/20. Each time the failure was between 43 and 52 days so the next failure should be between 3/21/20 and 3/30/20.

It seems like whenever we install hotfixes, it fixes the issue for 140-154 days but then it comes back. And if we don’t apply another hotfix, the issue reoccurs every 39-52 days. Does that make any sense?

Support says they need to see the server in a failed state, so i will have to wait another 10-20 days to get to that point. But i'm hoping im not the first to see this or maybe someone else has seen it.

Thanks
 

Prior to a reboot have you tried restarting IIS to see if that salves the issue?

solves*

Hello, same problem here. It's correct that over IIS-Reset the problem get's solved. I will now create a ticket for our client.

Good afternoon,

Based on a recent support investigation, the issue is often caused by a broken or outdated .NET Hosting Bundle on the DocuWare server, which prevents IIS app pools from starting.
 
The recommended solution is to download and install or repair the latest .NET Hosting Bundle.

• You can find it here: https://dotnet.microsoft.com/en-us/download/dotnet/8.0
• After installing, restart IIS or the individual DocuWare app pools.

 
To help others who may face the same issue, we will be creating a Knowledge Base Article that outlines this solution and relevant troubleshooting steps. If you have any feedback or questions about this process, please let us know.