It seems like Web Deploy ran into a connection issue while trying to publish your application.
The error message suggests that the connection to the server was unexpectedly terminated. it could be due to various reasons to encounter these issues.
you have to check stable internet connection and try to deploy after some time.
if not try to restart web management service on server.
Open Services. MSc → Find Web Management Service → Restart it and also check web deployment settings configurations to ensure they are correct and complete.
Also ensure the account user have proper IIS manager permissions and web deploy permissions.
https://learn.microsoft.com/en-us/previous-versions/troubleshoot/iis/troubleshooting-web-deploy
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