DNS question and no name available via DNS and no reverse DNS errors

We are running an OS X server, 10.4.11, OD Master. We are getting some error messages, and we have setup DNS to forward requests for example.com. (our website) to our web developer's external web server where our website is being hosted.
Oct 15 10:29:05 [server name omitted] servermgrd: servermgr_dns: no name available via DNS for 192.168.0.5
Oct 15 10:29:05 [server name omitted] servermgrd: servermgr_dns: no reverse DNS entry for server, various services may not function properly
Oct 15 10:31:48 [server name omitted] /usr/sbin/PasswordService: incorrect digest response
- and -
Oct 15 09:54:00 [server name omitted] DirectoryService[103]: GSSAPI Error: Miscellaneous failure (Server not found in Kerberos database)
Some Background:
We are running internal DNS services only. We have a domain, example.com. and our OS X Server, server.example.com. We have a website that is being hosted offsite by our web developer. Long ago when they were setting up the SSL certificate for the site, they obtained a certificate for example.com INSTEAD of www.example.com. So, our web developer setup a redirect to redirect web requests to www.example.com to example.com.
Now, this brings us to our OS X server (server.example.com). We are hosting internal DNS with the same domain, example.com. When employees inside our LAN would put in our web address, example.com, or www.example.com, it would take them to our OS X server. As a workaround, in the DNS settings for the zone in server Admin, I set the Server IP address for the zone to "Other" and specified the external address to the server where the site is hosted by our developer then setup an A record for our server. (We cannot forward requests to www.example.com since our web developer automatically redirects these requests to example.com since that is where the SSL certificate and the search engines are linked to).
Well obviously this had serious repercussions for server stability. So, I set the server IP address back to the address of our OS X server itself, 192.168.0.5.
Now, I then went into command line and manually edited the zone files. Here's part of our zone file:
$TTL 3600
example.com. IN SOA server.example.com. sysadmin.example.com. (
2008031015 ; serial
3h ; refresh
1h ; retry
1w ; expiry
1h ) ; minimum
example.com. IN NS server.example.com.
example.com. IN A [external IP address of web server]
server IN A 192.168.0.5
We are getting the following error messages regularly:
Oct 15 10:29:05 [server name omitted] servermgrd: servermgr_dns: no name available via DNS for 192.168.0.5
Oct 15 10:29:05 [server name omitted] servermgrd: servermgr_dns: no reverse DNS entry for server, various services may not function properly
Oct 15 10:31:48 [server name omitted] /usr/sbin/PasswordService: incorrect digest response
- and -
Oct 15 09:54:00 [server name omitted] DirectoryService[103]: GSSAPI Error: Miscellaneous failure (Server not found in Kerberos database)
Questions:
Do I need to go back to our zone file and change the A record for example.com. to match our OS X server's address: 192.168.0.5?
Secondly, is there anything I can do in DNS or elsewhere on the server to redirect web requests to example.com to our web developer's offsite server since the developer's server redirects www.example.com to example.com?
Thanks in advance? I am stumped.
Thanks,
Tyler

Problem was resolved.
All I ended up doing was edition my reverse lookup file, db.192.168.0. It was correct, and I simply re-saved it without making any changes. Strangely enough, that did it. No idea why. Maybe a permissions issue with the file?
I'm still running the server with address record for the domain (example.com.) mapped to our external web server. no problems.
Tyler

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