An incorrect network address (127.0.1.1) is shown on the page "System Information" in line "System hostname" after the hostname itself if it is the address of the loopback interface - although the "ifconfig lo" command as well as the "Network Configuration" page shows the correct address (127.0.0.1).
I forgot to mention the operating system which is Debian 6.0.
What IP address does your system have in the /etc/hosts file?
Thanks for the hint!
For any reason, apart from the first line "127.0.0.1 localhost", it contained a second line "127.0.1.1 [COMPUTERNAME]". So, I think, this bug can be closed.
That second line can probably be removed, or changed to use your external IP.
Yes, I already removed it.
Thanks again!