This can also be caused by miss configured FQDN. The session host
server should be set to
www.youredomain.com or
othersubdomain.youredomain.com.
The /etc/hosts file should have this in the top section:
127.0.0.1 localdomain.localhost localhost
192.168.0.205
www.domain.com www
The /etc/hostsname should have ONLY the sub domain like this (Check
value with the command "hostname"):
www
(I don't know why but I had to go to cd into /etc/ and then do nano
hostname to get the right file)
IP address and domains have to be changed to you're needs of course.
If you have a local ip as redirection name on the application server
and this is also the session host server, you will get the problem you
are describing.