after moving DDTSS server to the new location for a long time all worked
good using new URL:
but sometime ago login stopped working. If someone has the same
problem, here is short description of the problem with a temporary fix.
The problem is that login page is redirected using DNS name, but DNS
record is old and wrong. As a result login page is not loaded.
$ wget -c http://184.108.40.206/ddtss/
--2016-07-29 10:46:05-- http://220.127.116.11/ddtss/
Connecting to 18.104.22.168:80... connected.
HTTP request sent, awaiting response... 302 Found
--2016-07-29 10:46:05-- https://ddtp.debian.net/ddtss/
Resolving ddtp.debian.net (ddtp.debian.net)... 22.214.171.124
Connecting to ddtp.debian.net (ddtp.debian.net)|87.98.215.
Temporary fix of this problem is to add new entry to /etc/hosts: