They said the following:
support wrote:
It's some kind of proxy and/or extension that redirects him through an internal server, which in turn probably messes with cookies and authentication resulting in a 401 error.
He should try to :
- Delete cookies
- Check his operating system proxy settings and eventually disable his proxy server if he has one
- start his browser in safe mode
And try again. If he fails he should provide me his IP address to check logs
So could you try the above suggestions and let me know the outcome.
Regards, Mark.