Andrey, Thanks again for the input. Unfortunately we are using Exchange 5.5 and not Exchange 2000 so all lookups are done on the Exchange server and not with a global catalogue.
Regards, Paul -----Original Message----- From: Andrey Fyodorov [mailto:[EMAIL PROTECTED]] Sent: 11 September 2002 15:23 To: Exchange Discussions Subject: RE: MAPI/Outlook detailed logon process Another thought - are your domain controllers accessible from those workstations? Outlook 2000 an up can be used in two modes: A. Exchange server can proxy (NSPI Proxy) the logon request to the domain controllers or B. Exchange server tells Outlook the name of domain controller, Outlook caches it, and next time Outlook talks directly to the domain controller. When you initially create a profile, Exchange server *always* proxies that initial authentication (Check Names works quickly). Then if your Outlook is instructed by the server to go into mode B and caches the domain controller's name AND the domain controller is inaccessible, Outlook will take a long time to logon. You can configure Exchange server to always use NSPI proxy. There is an MS KB article about that. Search for NSPI. Or you can configure the preferred domain controller referral (your Exchange server may be telling Outlook to use one of your domain controllers that happens to be inaccessible) I think you are dealing with something like that + client's DNS cache getting screwy. Andrey Fyodorov Senior Exchange Administrator iNNERHOST http://www.innerhost.com -----Original Message----- From: Bendall, Paul [mailto:[EMAIL PROTECTED]] Sent: Tuesday, September 10, 2002 10:04 AM To: Exchange Discussions Subject: RE: MAPI/Outlook detailed logon process Hi Michelle, I have checked the RPC binding order and it is correctly set, this is also backed up by the fact that on the machines that have the problem, if you recreate the profile name resolution in the Mail Control Panel Applet takes less than 5 seconds to resolve the name to a Exchange server and mailbox. This is contrary to what would happen if the order was wrong as stated at the bottom of Q163576. Hence my feeling the issue has nothing to do with name resolution but is another part of the logon process. Thanks for your response though, Paul -----Original Message----- From: Harmon, Michelle M. [mailto:[EMAIL PROTECTED]] Sent: 10 September 2002 14:58 To: Exchange Discussions Subject: RE: MAPI/Outlook detailed logon process You may want to check their RPC binding order if you haven't done so. http://support.microsoft.com/default.aspx?scid=KB;EN-US;q163576&; -----Original Message----- From: Bendall, Paul [mailto:[EMAIL PROTECTED]] Sent: Tuesday, September 10, 2002 8:56 AM To: Exchange Discussions Subject: RE: MAPI/Outlook detailed logon process Thanks for your reply Andrey, However, I was under the impression that Outlook is a winsock application and therefore will resolve names via a hosts file and the DNS before using WINS and NetBIOS as outlined in Q172218 and Q155048. I am not convinced it is a name resolution issue anyway because it only effects a small number of users across multiple subnets and Exchange servers, while the vast majority of users have no problem. Regards, Paul -----Original Message----- From: Andrey Fyodorov [mailto:[EMAIL PROTECTED]] Sent: 10 September 2002 14:04 To: Exchange Discussions Subject: RE: MAPI/Outlook detailed logon process I would tend to think that WINS is more responsible for Outlook logon than DNS. Outlook is a NetBIOS type of animal. Have you tweaked the Provider order in the registry of your clients to match the network protocol used on your network? -----Original Message----- From: Bendall, Paul [mailto:[EMAIL PROTECTED]] Sent: Tuesday, September 10, 2002 8:59 AM To: Exchange Discussions Subject: MAPI/Outlook detailed logon process Hi all, Exch 5.5, SP4, post-SP4 hotfixes, Windows 2000 SP2 and Windows NT 4 SP6A I hope someone can help, does anyone know of a whitepaper that documents in detail the Outlook logon process? I want to know the order things are done, i.e. names resolution occurs first using DNS by default, then RPC connections to the Exchange server, then what happens when is the security token checked against the mailbox, how does Outlook Security Settings effect the logon as well as organisational form, address books, free-busy, etc, etc. Why I hear some of your cry, well we have been having an intermittent problem for some time in that occasionally (about 2 times a week) we will get a whole bunch of calls from users that complain that Outlook is hanging while logging in. The numbers are small say a maximum of 40 out of 4,500, they are located on different subnets, different Exchange servers (same site), etc, etc. I want to make a plan to start working through the logon process to see where things are failing and therefore need a detailed document on how Outlook logs onto the Exchange server. 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