Hello Dojo,

we are running a DMS on version 10.3.0.0-13374-CU7, and right now we are implementing several measures described in the DataMiner hardening guide.

One of the measures concerns secure client-server communication based on gRPC. Since this will be standard from 10.4.0 onwards, we wanted to take this step already now. So we followed the description here: https://docs.dataminer.services/user-guide/Advanced_Functionality/Security/DataMiner_hardening_guide.html#dataminer-cube (which is also including this here: https://docs.dataminer.services/user-guide/Reference/Skyline_DataMiner_Folder/More_information_on_certain_files_and_folders/ConnectionSettings_txt.html)

At first, everything seemed to work just fine, and the Cube connection was working on gRPC as it should. Cube "About" -> connection:
Attributes = AcceptsCollaborationMessages, Cube, AllowMessageThrottling, GrpcConnection

Then we realized that on some machines, concerning some users, login was no longer possible:

This definitly seems to be connected to the implementation of gRPC. Before activating gRPC, we've had no such issues. After performing some testing, including Cube updates and re-installs, we deactivated gRPC again (type=LegacyRemotingConnection;polling=1000;zip=true), and login was possible again immediatly.

Any idea what might be the solution for this one?

Thanks a lot for your thoughts on this!

KR
Nils