RPC connection error

Have you tried using gRPC instead of RPC? RPC over TCP/IP can have payload size limitations, which might cause issues in certain scenarios. It’s unusual that this behavior would only occur on Windows 11, but it’s worth considering whether the payload limits are being reached.

Some information about the RPC payload limit in this support article: Large-size metadata card configuration editing with TCP/IP protocol causes "Access is denied" error

We have tried gRPC and still get the error randomly.  Looking at our Metadata configuration for this class we up to 4 rules that can trigger depending on the properties that are filled out.  The main rule is only 59 KB.  Looking at all of our rules for metadata card configuration no matter what class is used comes to 288 KB.  I'm still wondering if it is something in our rules that can make this happen.  I do find it odd that it only happens on Windows 11 as well and with multiple users.  Its very hard to replicate the error to try troubleshooting since it is random. 

We tried having the user use the New client but it is limited features so it has degraded their performance when entering documents.  I might have them try again since new features seem to keep getting added each month.

We have tried gRPC and still get the error randomly.  Looking at our Metadata configuration for this class we up to 4 rules that can trigger depending on the properties that are filled out.  The main rule is only 59 KB.  Looking at all of our rules for metadata card configuration no matter what class is used comes to 288 KB.  I'm still wondering if it is something in our rules that can make this happen.  I do find it odd that it only happens on Windows 11 as well and with multiple users.  Its very hard to replicate the error to try troubleshooting since it is random. 

We tried having the user use the New client but it is limited features so it has degraded their performance when entering documents.  I might have them try again since new features seem to keep getting added each month.

Please try the new client again and see if that helps. New features are indeed added monthly and most of the high-priority ones are already included. You can check the progress here: Latest enhancements in the new M-Files Desktop

If this still keeps happening, it might be worth contacting your M-Files reseller and see if they have any thoughts. It would be also useful to get the full error stacks when this happens, in case they need to contact our Support team for further investigation.