Strange access log messages - CGIDEV2

I have created a CGIDEV2 HTTP server and am serving a simple web page with
info from my database.

I appear to have a few iSeries Access users (always the same 2) that are
causing messages to be written to the access log. These users DO NOT use
my web page. I am thinking there must be something in iSeries Access
config or my HTTP server config that is causing this anomaly. I do not
understand how they could have anything at all to do with the HTTP server.
They do not even know the IP address or DNS name of the server. It seems
to happen when they first start iSeries Access emulation for the day.

The log messages are:
10.0.4.72 - - [16/Dec/2008:07:34:39 -0800] "OPTIONS / HTTP/1.1" 200 -
10.0.4.72 - - [16/Dec/2008:07:34:39 -0800] "PROPFIND /QIBM HTTP/1.1" 405
230
10.0.4.72 - - [16/Dec/2008:07:34:39 -0800] "PROPFIND /QIBM HTTP/1.1" 405
230

HTTP config file:













7
ServerRoot /cgidev2
8
Listen 80
9
DefaultType text/html
10
# CGI
11
CGIConvMode %%EBCDIC/EBCDIC%%
12
ThreadsPerChild 53
13
MaxCGIJobs 100
14
StartCGI 2 QTMHHTP1
15
Timeout 120
16
# PERSISTENT CGI
17
MaxPersistentCGI 5
18
CGIRecyclePersist on
19
PersistentCGITimeout 60
20
# PERFORMANCE
21
DynamicCache on
22
CacheLocalSizeLimit 25000
23
FRCAEnableFileCache On
24
FRCACacheLocalFileRunTime /cgidev2/*.gif
25
#=========================================================================
26
# PART 2
27
#=========================================================================
28
Options +ExecCGI -FollowSymLinks -SymLinksIfOwnerMatch +Includes
-Indexes -MultiViews
29
AlwaysDirectoryIndex off
30
DirectoryIndex index.html welcome.html
31
# The following directives regard the HTTP instance logs
32
# They are commented out. Uncomment them to have the logs generated
33
ErrorLog /cgidev2/logs/basic_error_log
34
LogFormat "%h %l %u %t \"%r\" %>s %b" common
35
CustomLog /cgidev2/logs/access_log Common
36
LogMaint /cgidev2/logs/basic_error_log 30 0
37
LogMaint /cgidev2/logs/access_log 14 0
38
LogLength 512000000
39
#
40
SetEnvIf User-Agent "Mozilla/2" nokeepalive
41
SetEnvIf User-Agent "JDK/1\.0" force-response-1.0
42
SetEnvIf User-Agent "Java/1\.0" force-response-1.0
43
SetEnvIf User-Agent "RealPlayer 4\.0" force-response-1.0
44
SetEnvIf User-Agent "MSIE 4\.0b2;" nokeepalive
45
SetEnvIf User-Agent "MSIE 4\.0b2;" downgrade-1.0
46
SetEnvIf User-Agent "MSIE 4\.0b2;" force-response-1.0
47
#=========================================================================
48
# PART 3
49
#=========================================================================
50
#---- CGIDEV2 directives
51
Alias /CGIDEV2/ /qsys.lib/cgidev2.lib/
52
ScriptAlias /CGIDEV2P/ /qsys.lib/cgidev2.lib/
53
ScriptAliasMatch /cgidev2p/(.*) /qsys.lib/cgidev2.lib/$1
54
Alias / /qsys.lib/cgidev2.lib/htmlsrc.file/BWD104IN.MBR
55
#=========================================================================
56
# PART 3
57
#=========================================================================
58
#---- CGIDEV2 directives
59
<Directory /QSYS.LIB/CGIDEV2.LIB>
60
Options None
61
order allow,deny
62
allow from all
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</Directory>
64
#


66
NameVirtualHost 10.0.1.156:80








71
<VirtualHost 10.0.1.156:80>
72
ServerName wdibmiweb
73
DocumentRoot /www/wdibmiweb
74
</VirtualHost>

Any ideas are most welcomed.

Thanks.