setup iphone 3G on exchange 2003

HI,
iam trying to setup iphone 3G on exchange 2003 sp2, i have enabled all setings within active synch on the exchnage imap is enabale on all users as well and it doesnt work
i am able to pass the exchange verefication during the account setup but then it shows me only
the inbox and keep pop up an error massege "cannot get mail,connection to the server failed"
here is a log from the exchange SMTP log
/exchange/testactivesynch@CHDIFoundation.org/NON_IPM_SUBTREE/Microsoft-Server-ActiveSync/iPhone/Appl81835MKDY7H - 80 - 192.168.69.94 Microsoft-Server-ActiveSync/6.5.7638.1 401 2 5
2009-03-12 00:02:28 W3SVC1 192.168.69.94 POST /Microsoft-Server-ActiveSync User=testactivesynch&DeviceId=Appl81835MKDY7H&DeviceType=iPhone&Cmd=FolderSync&Log=V4TNASNC:0A0C0D0FS:0A0C0D0SP:1C1I469S592R0S0L0H0P 443 testactivesynch  Apple-iPhone/508.11 500 0 0

i have checked the config on the oma folder within the IIS, i have found that "enable anonumous access" is un checked, is that the right config?
i got an error msg when i tried to browse http:\\servername/oma ,also i would like to mention that there is a certificate installed on both owa and oma issued by CA(not self cert)

please advice