Application Development Software

Hello,
I am using the JES 05Q4.
I configured a front end and a backend server as per Ch.6 in the Calendar server Admin Guide.

The calendar server is working properly on the backend. I installed and configured the calendar server on the frontend. At first it was working well. But after I edited the ics.conf file to configure it as frontend server I had an error on login: "Backend Database Host Context Unavailable".
Below are the errors in the http log of the calendar. Though I have set the parameters in the ics.conf file to point to the backend as described in the Admin Guide, I still get an error like below. The backend is reachable:
root@front1 # telnet backend.domain.com 59779
Trying 172.16.1.24...
Connected to backend.domain.com.
Escape character is '^]'.
GAP Service Ready

LOGS:
[23/Apr/2007:16:03:10 +0300] front1 cshttpd[2619]: General Error: caldb: cdwp_ctx_from_host_and_port: DWP Host name and port (backend.domain.com:59779) not found in DWP host & port entries, maintained in ics.conf (check ics.conf).
[23/Apr/2007:16:03:10 +0300] front1 cshttpd[2619]: General Error: caldb: cdwp_get_sessionid_from_host_and_port: DWP Host name and port (backend.domain.com:59779) not found in DWP host & port entries, maintained in ics.conf (check ics.conf).
[23/Apr/2007:16:03:10 +0300] front1 cshttpd[2619]: General Error: caldb: cdwp_readcalprops: ctx for host:backend.domain.com and port:59779 is NULL.
[23/Apr/2007:16:03:10 +0300] front1 cshttpd[2619]: General Error: caldb: caldb_pvt_ReadCalProps: psRelativeCalID= jdoe, psQualified = dwp://backend.domain.com:59779/jdoe, psLDAPQualified = NULL, iError = 11004.
[23/Apr/2007:16:03:10 +0300] front1 cshttpd[2619]: Account Notice: Failed to login: jdoe, check database server is up and running, errorcode=11004
[23/Apr/2007:16:03:31 +0300] front1 cshttpd[2619]: General Notice: Process has not accepted connections 2048 times