If the Overcast Technical User (Salesforce Job connection string user) credentials are used to log in with Salesforce tools, the Overcast session ID may be invalidated and cause Data Synchronization Scenarios to fail to run from the Salesforce INVALID_SESSION_ID error.
It is recommended to not use the Overcast Technical User with other tools. All developers/administrators should use their own Salesforce credentials to log in with Salesforce tools.