The connector was working previously and now fails with error -
[ConnectorError] 500 500, Request failed with status code 500, undefined, “s:ClientUnable to perform operation. User certificate not valid. Call the LoginService prior to other services.” (requestId: e6ace97c197941ba84f9490dfca921ba).
The connection/all calls work without issues from postman. Has something changed at connector level ?
This looks like error happening during connection to the web services. Looking at the error, it seems like issue is with the certificates used for connection to web-services. Have you checked if all certificates used for the SSL connection between VA and Webservices are valid? Have they expired or revoked on the server side?