Thanks for the quick reply! Sorry, I forgot to paste the "global" part of the config, I have that URL already set:

[global]
;Main Settings
;=============
Usr = elog
Grp = elog
port = 8080
SSL = 0
URL = https://elog.test.km3net.de
Title image = <img border=0 src="KM3NeT_logo.png" alt="KM3NeT logo" height="35px">
;SMTP host = smtp.fau.de
Display mode = summary
Thumbnail size = 500>
List Menu text = clock.html
Menu text = clock.html