Hi All, I have a some event logs on my exchange 2007 mailbox server but not sure what it all means. Could anyone help with this? Note I have both exchange 2003 and 2007 co-existing. Event1: MSDTC encountered an error (HR=0x80000171) while attempting to establish a secure connection with system exc2k7server Event2: The store driver couldn't deliver the public folder replication message "Folder Content (Exc2k3server-IS@domain.net)" because the following error occurred: MapiExceptionNetworkError: Unable to make connection to the server. (hr=0x80040115, ec=-2147221227) Diagnostic context: ...... Lid: 10648 dwParam: 0x6D9 Msg: EEInfo: Generating component: 2 Lid: 14744 dwParam: 0x6D9 Msg: EEInfo: Status: 1753 Lid: 9624 dwParam: 0x6D9 Msg: EEInfo: Detection location: 501 Lid: 13720 dwParam: 0x6D9 Msg: EEInfo: Flags: 0 Lid: 11672 dwParam: 0x6D9 Msg: EEInfo: NumberOfParameters: 4 Lid: 8856 dwParam: 0x6D9 Msg: EEInfo: prm[0]: Unicode string: ncacn_ip_tcp Lid: 8856 dwParam: 0x6D9 Msg: EEInfo: prm[1]: Unicode string: exc2k7server.domain.local Lid: 12952 dwParam: 0x6D9 Msg: EEInfo: prm[2]: Long val: -1527653632 Lid: 12952 dwParam: 0x6D9 Msg: EEInfo: prm[3]: Long val: 382312662 Lid: 19778 Lid: 27970 StoreEc: 0x80040115 Lid: 17730 Lid: 25922 StoreEc: 0x80040115. Event3: NSPI Proxy failed to connect to Global Catalog dc-server.domain.local over transport Tcp/Ip. This server is down or unreachable. Clients will not be directed to this GC until it is available again. Event4: OALGen could not update the timestamp of the previous version of offline address list '\Global Address List'. Please check earlier event log messages for the specific error. - Default Offline Address List OALGen encountered error 8004010f (internal ID 501080c) accessing the public folder store while generating the offline address list for address list '\Global Address List'. - Default Offline Address List Isaac2k2

Sounds like network, DNS, or server issues. Everything up and running? Services started?

Yes all services are up and running. I tend to agree with you that its all network related because my exchange server and DCs are on seperate tiers. I have been having difficult times getting my networks resource guy to allow the appropriate ports but he seems to think he has done it. I got the firewall log sent to me by another team member and noticed this deny comment: 18:35:34,%FWSM-4-106023: Deny tcp src exchange:xxx.xxx.xxx.xxx (my exc2k7 IP)/37784 dst inside:yyy.yyy.yyy.yyy (DC IP)/3045 by access-group "aclexchange" [0x70dc7886, 0x0] 18:35:43,%FWSM-4-106023: Deny tcp src exchange:xxx.xxx.xxx.xxx (my exc2k7 IP)/37790 dst inside:yyy.yyy.yyy.yyy (DC IP)/50000 by access-group "aclexchange" [0x70dc7886, 0x0] I will be the most happiest man on earth if someone could guide me to usefull links regarding the appropriate ports that needs to be opened for exchange and the DCs. I am already awar of this link http://technet.microsoft.com/en-us/library/dd789693%28EXCHG.80%29.aspx. Also what effect does this entry which was already added to my DC have on exchange communication port: Go to Component services\Computers, right-click on my computer, click on properties\default protocols, under DCOM protocol, click Connection-Oriented TCP/IP and click on properties, under port range there is a defined port range of 50000-50500. Is there any tool I can use to query all exchange 2007 required ports like portquery.exe? Thanks Isaac2k2

Have you seen these? (Exchange 2007 info listed at bottom) http://support.microsoft.com/kb/270836 Exchange Server static port mappings http://technet.microsoft.com/en-us/library/bb331973.aspx Exchange Network Port Reference

Yes I had seen this two posts.Isaac2k2

Hi Isaac2k2, Agree with Andy, so, kindly suggest that you could confirm the configuration with your netwok guy carefully, such as the network devices, the firewall and so on. You also use telnet to the port from each server to confirm it. Regards! gavin

Hi Isaac2k2, Any update for your issue? Regards! gavin