My /etc/httpd/conf.d/BackupPC.conf file (which is the default in
Fedora 12) restricts access to localhost (which makes sense) as
follows:
   allow from 127.0.0.1

My /etc/hosts file has these (Fedora default) lines at the top:
   127.0.0.1   localhost localhost.localdomain localhost4 
localhost4.localdomain4 mycomputer.mydomain
   ::1         localhost localhost.localdomain localhost6 
localhost6.localdomain6 mycomputer.mydomain

When I access the web interface from my Console, using either
http://127.0.0.1/BackupPC or http://localhost/BackupPC, everything
works (as expected) and the httpd access_log records the access as coming
from 127.0.0.1

However when I access the web interface via an ssh tunnel using 
-L 8145:localhost:80 and http://127.0.0.1:8145/BackupPC, somehow the
address gets translated to ::1 (as shown by the httpd error_log
records) which causes access to be denied.

Now I know I can fix this either by removing the ::1 line from the
hosts file or by adding ::1 to the /etc/httpd/conf.d/BackupPC.conf
file.

But I want to understand first why in an ssh tunnel the 127.0.0.1:8145
address would be translated to ::1 rather than to 127.0.0.1


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