@MSD2 From the error message it appears there is some issue with your proxy configuration within Studio. Could you please review the proxy setting in Studio following below options-
@MSD2: Could you please confirm if you are using proxy server and if yes, then enter your proxy server detail in the setting and try publishing.
I dont think I am using a proxy server. I was using default settings and it worked fine till couple of weeks back.
@MSD2 Could you please confirm the error message you are getting while publishing project. Are you able to validate the project from Studio project configuration ? Do you get publish error for all the projects or some particular projects?
@MSD2: I just wanted to follow up to see if any responses answered the questions you had. If so, please indicate the appropriate response as the Accepted Solution for the benefit of other Community members who have the same question. If you have further questions/issues, please advise on your current status.