Redmine

Hi,
This morning, I changed the subnetmask of our network.
From 192.168, we are now on 172.20 .
Our "Redmine" server were on 192.168.0.210 and is now 172.20.0.210 .
I thought I managed all the modifications I had to do, but it seems that this is not the case.
(Changes into httpd.conf and hosts files)

Only for the redmine's pages, I received the following messages :

Service Temporarily Unavailable

The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.

Any other pages served by apache webserver are ok !

Actual known configuration :
OS : CENTOS 5
DB : Mysql
Redmine : 0.8.? (installed on february 2009)

Did someone already managed the situation.
Thanks in advance.

Laurent Richelle