KDE Desktop Client can't connect anymore (timeout, no ask for credentials/password)

Maybe relevant:

Interesting. ownCloud-provided clients aside, for a moment …

Dolphin

webdavs://demo.owncloud.org/remote.php/webdav
fails to present an authentication dialogue.

$ drill demo.owncloud.org
;; ->>HEADER<<- opcode: QUERY, rcode: NOERROR, id: 40545
;; flags: qr rd ra ; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0 
;; QUESTION SECTION:
;; demo.owncloud.org.   IN      A

;; ANSWER SECTION:
demo.owncloud.org.      1971    IN      CNAME   betty.owncloud.com.
betty.owncloud.com.     1971    IN      A       136.243.60.151

;; AUTHORITY SECTION:

;; ADDITIONAL SECTION:

;; Query time: 9 msec
;; SERVER: 192.168.1.1
;; WHEN: Sun Mar 12 15:53:40 2017
;; MSG SIZE  rcvd: 83
$ uname -v
FreeBSD 12.0-CURRENT #40 b3d5020(drm-next): Tue Feb 28 16:23:55 UTC 2017     root@gauntlet:/usr/obj/usr/src/sys/GENERIC 
$ 

webdavs://136.243.60.151/remote.php/webdav
results in a trust routine for an SSL certificate-related error. A shot from that routine:

I can opt to trust the certificate but still, Dolphin does not proceed to present an authentication dialogue.

Consider today’s 305952 – The webdav in Dolphin doesn't work with certain service (ogodisk)