Digest auth broken
When HTTP auth is set to Digest, auth is broken in Firefox.
Firefox caches used auth parameters and tries to use realm, nonce,... from last time.
Tvh just refuses them with UHAUTHORIZED without providing WWW-Authenticate header, see:
The proper response should be UNAUTHORIZED with WWW-Authenticate header and an additional field stale=TRUE , see:
To simulate this, set auth to Digest in TVH, Login with Firefox, restart TVH and refresh TVH interface in FF.