adapcctl.sh: exiting with status 204

On a new VIS R12.1 installation, the OHS (oracle http server) failed to start and give status 204.

Upon querying the status of opmn managed processes with adopmnctl.sh, the following status is shown:

Processes in Instance:
---------------------------------+--------------------+---------+---------
ias-component                    | process-type       |     pid | status
---------------------------------+--------------------+---------+---------
OC4JGroup:default_group          | OC4J:oafm          |    9713 | Alive
OC4JGroup:default_group          | OC4J:forms         |    9648 | Alive
OC4JGroup:default_group          | OC4J:oacore        |    9570 | Alive
HTTP_Server                      | HTTP_Server        |     N/A | Down




On  driilling through the http server logfile on $INST_TOP/logs/ora/10.1.3/opmn/HTTP_Server~1.log

found some error like this:

10.1.3/Apache/Apache/bin/httpd: error while loading shared libraries: libdb.so.2: cannot open sh
ared object file: No such file or directory

I thought this could be due to some link files, not properly linked on /usr/lib or /lib folders.
I searched for link file libdb.so.2 on /usr/lib and /lib folders. But nothing found.
So, I  went on creating a link file " libdb.so.2" on both the folders.

Now, I restarted the OHS.

This time it gave the same 204 status. Http log shows,

Cannot load $IAS_ORACLE_HOME/Apache/Apache/libexec/mod_ossl.so into server: $IAS_ORACLE_HOME/Apache/Apache/libexec/mod_ossl.so: undefined symbol: dbm_firstkey

Now, the situation got really worse. I googled a lot, but found nothing related.

Finally, I checked for the pre-requisite rpm one-by-one. I referred Metalink doc:607883 once again.
 There I got the fix.

I missed to apply patch 607883. It was clearly mentioned on this doc, that this patch would fix an issue with the Oracle HTTP Server (missing libdb.so.2)

Applied the patch and this time OHS started fine.