Same here, Webmin 1.881 debian9 and two factor login. if I restart webmin I can enter, but in logs there are same errors [28/Apr/2018:22:01:40 +0200] [xxx.aaa.xxxMYIP] / : Bad Header [28/Apr/2018:22:01:41 +0200] [xxx.aaa.xxxMYIP] / : Bad Header [28/Apr/2018:22:01:54 +0200] [xxx.aaa.xxxMYIP] / : Bad Header [28/Apr/2018:22:10:25 +0200] miniserv.pl started [28/Apr/2018:22:10:25 +0200] IPv6 support enabled [28/Apr/2018:22:10:25 +0200] Using MD5 module Digest::MD5 [28/Apr/2018:22:10:25 +0200] Using SHA512...