You may get “(TR3117) Unable to retrieve security objects. Please verify credentials” while connecting from TM1 to for example SAP BW.
Basically TM1 uses old good Transformer to get the data/metadata. This error means the username/password are incorrect. Usually it happens when user’s password get changed. To update the password, open your TI process, go to Data Source tab, change the password, then go to the Signons button, located to the right of the User ID and Password, and update the password there. Then save the process and test again.
As per best practice, for such things we should use a system account with a non-expiring password.
But sometimes it happens when a developer was testing something with his/her own account and forgot to delete it from signons.