I'm having an issue, where SharePoint designer is not able to connect to my sharepoint site, I'm given the below message:
I googled this issue and found topics highlighting the below points:
New Relic agent problem
My finding, no New Relic agent is installed on the servers.
Issue with Security Token Service Application
My finding, the security token service application is up and running, and it's browsable, it opens without any issues.
Sometimes, SharePoint designer is trying to connect to the site, in the "open site "dialog, the site name is something like this "DavWWWRoot (\site.domain.com)" , but then when I click Open, I'm given nearly the very same message above.
Any idea? Much appreciated.