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Working Outlook 2003 RPC but failing Outlook 2007 RPC - 28.Jun.2007 10:12:42 AM

Jeroen_317

Posts: 75
Joined: 18.Dec.2002
From: Belgium
Status: offline

Hi,

I have a customer with ISA 2006 where we recently configured Outlook RPC over HTTPS.
This works perfectly for Outlook 2003 but when someone uses Outlook 2007 (on XP or Vista) then it fails.
Anyone know what's causing this? I don't have that much experience with ISA 2006. In ISA 2000 I would check the urlscan.logs but I don't know where I can find these in ISA 2006.

TIA,
J.

Post #: 1

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RE: Working Outlook 2003 RPC but failing Outlook 2007 RPC - 28.Jun.2007 10:16:30 AM

tshinder

Posts: 50013
Joined: 10.Jan.2001
From: Texas
Status: offline

Is the CA certificate installed on the OL2007 machine?

Tom

_____________________________

Thomas W Shinder, M.D.

(in reply to Jeroen_317)

Post #: 2

RE: Working Outlook 2003 RPC but failing Outlook 2007 RPC - 28.Jun.2007 10:31:14 AM

Jeroen_317

Posts: 75
Joined: 18.Dec.2002
From: Belgium
Status: offline

Hi Tom,

we are using a test PC running Windows XP which is not member of the domain. It is attached to a separate DSL line to emulate a remote user.

On that PC we imported the CA certificate, installed Outlook 2003, configured RPC over HTTPs and it worked.

We uninstalled Outlook 2003, installed Outlook 2007 and it fails.
We uninstall Outlook 2007, reinstall Outlook 2003 and it works.

I'll go to the customer soon to try myself but I don't know what he can be doing wrong. The Exchange server is Exchange 2003.

I hope this info helps.

(in reply to tshinder)

Post #: 3

RE: Working Outlook 2003 RPC but failing Outlook 2007 RPC - 3.Jul.2007 6:10:04 AM

Jeroen_317

Posts: 75
Joined: 18.Dec.2002
From: Belgium
Status: offline

I've done some testing.
Our setup is a Check Point firewall with an ISA 2006 unihomed in DMZ.
The Exchange 2003 is located internally.

When an Outlook 2007 client connects, I see RPC_IN_DATA failing and RPC_OUT_DATA allowed in ISA 2006 monitoring.

On our firewall I noticed that the Exchange was trying to connect on TCP 6004 towards the DMZ ISA. This was blocked but I allowed this now. I am unsure if this was the case with Outlook 2003, I'll go and check.

At the moment it's still not working.

I installed the Exchange2007 patch for ISA 2006 hoping it might help but it didn't.

:/

(in reply to Jeroen_317)

Post #: 4

RE: Working Outlook 2003 RPC but failing Outlook 2007 RPC - 4.Jul.2007 11:52:02 AM

tshinder

Posts: 50013
Joined: 10.Jan.2001
From: Texas
Status: offline

Hork mode (unihomed) is always a problem. At this point I no longer support such configurations.

Tom

_____________________________

Thomas W Shinder, M.D.

(in reply to Jeroen_317)

Post #: 5

RE: Working Outlook 2003 RPC but failing Outlook 2007 RPC - 13.Jul.2007 5:12:29 AM

Jeroen_317

Posts: 75
Joined: 18.Dec.2002
From: Belgium
Status: offline

I got it to work using this:

1. Click Start, click Run, type regedit in the Open box, and then click OK.
2. Locate and then click the following subkey: HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\RPC
3. If the RPC key does not exisit, Right-click on the Outlook Key and select New Key and call it RPC.
4. On the Edit menu, point to New, and then click DWORD Value.
5. Type DefConnectOpts, and then press ENTER.
6. Right-click DefConnectOpts, and then click Modify.
6. In the Value data box, type 0, and then click OK.
7. Exit Registry Editor.
8. Close Outlook and re-open it.

I hope I am helping some people with this.

J.

(in reply to tshinder)

Post #: 6