Re: [cups-devel] No authentication data provided

I can't find anything port related. Looks more like a change in
connection authentication. access.log says:

D [25/Sep/2016:15:32:37 +0200] [Client 38] Accepted from [v1.::ffff:127.0.0.1]:50016 (IPv6)
D [25/Sep/2016:15:32:37 +0200] [Client 38] Waiting for request.
I [25/Sep/2016:15:32:37 +0200] Expiring subscriptions...
D [25/Sep/2016:15:32:37 +0200] [Client 38] GET / HTTP/1.1
D [25/Sep/2016:15:32:37 +0200] cupsdSetBusyState: newbusy="Active clients", busy="Not busy"
D [25/Sep/2016:15:32:37 +0200] [Client 38] Read: status=200
D [25/Sep/2016:15:32:37 +0200] [Client 38] No authentication data
provided. D [25/Sep/2016:15:32:37 +0200] [Client 38] cupsdSendHeader:
code=403, type="text/html", auth_type=0 D [25/Sep/2016:15:32:37 +0200]
[Client 38] Closing connection. D [25/Sep/2016:15:32:37 +0200]
cupsdSetBusyState: newbusy="Not busy", busy="Active clients" I
[25/Sep/2016:15:32:38 +0200] Expiring subscriptions...


D [25/Sep/2016:15:32:37 +0200] [Client 38] No authentication data provided.

DefaultAuthType is "Basic" in cupsd.conf using gnutls. This worked well
in the past. Neither local nor remote access is possible to the
webinterface. Any idea what has changed? It doesn't matter if I use
Chromium, Firefox or links browser.

-Andy