To resolve this error, the suggestion would be to Reset your Salesforce user password or may reach out to your Salesforce Admin to reset the password and use a new password.
Note: Whenever a Salesforce user's password is reset or changed, automatically a new security token gets generated. This newly generated security token is required next to the new password while configuring the connection in Scribe Insight.
Also, If a DTS using a Salesforce connection, and if the user's password or security token gets changed or expires, the connection name appears to be in "red" when DTS opens in the scribe workbench. Please see the below-attached screenshot,
To verify the connection is working, try refreshing metadata for connection. Please see below knowledge article to refresh metadata for salesforce connection.
https://support.tibco.com/s/article/Refresh-Metadata-with-the-Salesforce-Adapter