mod_log-any/3537: Access_log logging strange 'undefined' entries

[Darrel Earhart <or...@yahoo.com>]

>Number:         3537
>Category:       mod_log-any
>Synopsis:       Access_log logging strange 'undefined' entries
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    apache
>State:          open
>Class:          support
>Submitter-Id:   apache
>Arrival-Date:   Tue Dec 15 08:00:01 PST 1998
>Last-Modified:
>Originator:     orion406@yahoo.com
>Organization:
apache
>Release:        1.2.4
>Environment:
Solaris 2.5.1, all current patches
>Description:
I've had this problem with both Apache and NCSA HTTPD1.3 web servers. The access
_log logs an entry similar to this:
machine.domain.whatever - - [07/Dec/1998:13:12:40 -0500] "GET /undefined HTTP/1.0" 404 -

These entries are beginning to flood the access_log, going into the hundreds of thousands. 
What is causing this "/undefined" or "/null" entry? And what makes it strange is that 
the log entries happen within seconds of eachother during times when no one is on the machine. 
>How-To-Repeat:
Don't know -- on an intranet. 
>Fix:
I know it can't be someone going to documents that are simply not there, it wouldn't 
produce such an entry.And I know that the time pattern, although close, is not 100% consistent. 
>Audit-Trail:
>Unformatted:
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