No User-Agent Logging

I can't seem to get Apache to log the user-agent and referer in the Httpd-Access.log even though I've specified the "Combined" log string.

Here's the LogFormat:
Code:
"%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined
I've also tried to use the "agent" CustomeLog which is:
Code:
LogFormat "%{User-agent}i" agent
and my httpd-agent.log files are empty.

Has anyone run into this problem before?

Thanks.
 
Simply using

Code:
CustomLog /path/to/access_log combined

will include both Referrers and User-Agents.
 
Maybe the web browser doesn't send a User-Agent: header?
 
Nope. Testing from several browsers that have been used to validate other systems.

Thanks for the help.
 
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