How many DC/GC do youth have in your environment, and in the site where the Outlook 2000 user is located. - about 12 dc in the problematic child domain, thereof are 3 GC But his can not be the problem! The whole AD child domain with DC/GC are within the same subnet(s) and are not restricted by firewalls. There is open communication inside the AD child domain. The blocked network connection is between the new outlook 2000 / exchange 2000 clients and some (not all) of the older 5.5 servers. It seems the clients want to communicate with exch5.5 servers which also are in a mixed-mode site, means also having a 2000 exchange server in the site. Plain old 5.5 sites don't want the client to contact. Why does the client want to contact these 5.5 servers? I am also wondering, because they should if at all talk to the exchange 2000 servers in other sites? _____ Von: Periyasamy, Raj [mailto:Raj.Periyasamy@xxxxxxxxxxxx] Gesendet: Donnerstag, 5. Februar 2004 22:19 An: [ExchangeList] Betreff: [exchangelist] RE: E2K / Mixed Mode / Clients hang http://www.MSExchange.org/ How many DC/GC do youth have in your environment, and in the site where the Outlook 2000 user is located. Is the Exchange 2000 server located in the same site where the Outlook 2000 users and DC/GC server located. From your symptoms, it looks like your outlook 2000 client is not able to talk to the DC/GC as provided by the Exchange server. Exchange 2000/Outlook 2000 is active directory aware configuration, hence your client will try to resolve names directly from the DC/GC. The best thing to do, identify which DC/GC is used by the troubled outlook 2000 client. You can do this by opening the Tools - Address Book -Options from your Outlook, select Global address List - Properties, this will tell you which DC/GC is is the address book provider this client. If the client is not able to talk to this DC/GC or if there is slow response from this DC/GC you will see the symptoms you have explained. Regards, -----Original Message----- From: Christian.Schramm@xxxxxxx [mailto:Christian.Schramm@xxxxxxx] Sent: Thursday, February 05, 2004 4:08 PM To: [ExchangeList] Subject: AW: [exchangelist] RE: E2K / Mixed Mode / Clients hang Outlook 2000 -----Ursprüngliche Nachricht----- Von: Periyasamy, Raj [mailto:Raj.Periyasamy@xxxxxxxxxxxx] Gesendet: Do 05.02.2004 19:43 An: [ExchangeList] Cc: Betreff: [exchangelist] RE: E2K / Mixed Mode / Clients hang http://www.MSExchange.org/ What version of Outlook ? Regards, -----Original Message----- From: Christian.Schramm@xxxxxxx [mailto:Christian.Schramm@xxxxxxx] Sent: Thursday, February 05, 2004 12:17 PM To: [ExchangeList] Subject: [exchangelist] E2K / Mixed Mode / Clients hang http://www.MSExchange.org/ Dear list, After migrating some test users to the exchange 2000 server, we are discovering some issues. Config as followed: - Mixed mode site (one 5.5 server / one exchange 2000 server) - Site integrated in organization with several different sites (some also in mixed mode, some plain 5.5) - Between some the sites are packet filters / firewalls which don`t let unknown traffic pass through The issues we discovered are: - Outlook clients with E2K-mailboxes often hang on startup or while trying to delete an unread read-notification (?) - While hanging we are discovering the clients want to contact several exchange 5.5 servers in different sites --> running against firewall --> timeout --> outlook freezes - The target ports are 135, 139 (netbios) and 445 (Microsoft-ds) - Clients with mailboxes on the old 5.5 server do not have these kind of problems So my question is, why do the exchange 2000 clients want to talk to so many 5.5 servers? Is it possible to turn this communication off? Since this behaviour is restricting the usability of the new clients and we don't want to open these "unsecure" ports on the firewall for all clients, I need a solution soon. Any comments and hints are welcome. Thank you in advance. 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