I was receiving this message when trying to get into SAC.
Could Not Login
Could not fetch configuration information.
Possible problem with administration server
I deleted the sxadmin and sxqueryadmin like some other people suggested and still didn't work.
So I found about changing this information. /var/opt/scalix/ml/res/config/res.properties
res.ubermanager.host=mail.wluctv6.com
#remote notification port:
res.ubermanager.udp.port=3450
res.tomcat.tcp.port=
# location of the registration store relative to where /etc/opt/scalix/res/store
res.events.store=events.data
#number of notification threads Max is 3
res.notification.numThreads=2
i changed the res.tomcat.tcp.port= to res.tomcat.tcp.port=80 , but it still didn't work.
So I checked all the LDAP ports according to the Scalix Wiki and found that I was missing the information from the /etc/sysconfig/ldapmapper and I also kept mine at 389 and didn't change then to 3890.
http://www.scalix.com/wiki/index.php?title=Howto_-_Change_the_default_Scalix_ldap_port_from_389
The last thing I tried was according to the Scalix Manual Installation Wiki to change the Java settings. Mine was set at 1024MB and i dropped down to 512MB like the Wiki states.
http://www.scalix.com/wiki/index.php?title=Manual_Installation#Setting_Tomcat_memory_allocation
Edit the following line in /etc/opt/scalix-tomcat/scalix-tomcat.conf so that JAVA_OPTIONS has parameters that allocate 50% of your RAM or 512MB, whichever is less, to your Tomcat application server, e.g.
JAVA_OPTS="-server -Xms256m -Xmx256m"
One or both of the last two things worked for me and now I can login to SAC anytime of the day. Hopefully this helps someone else because I know how frustrating it can be.