hi we have 3 exchange servers .. 2 with the mailbox role and 1 for transport and client access. at the same time all exchange services in the 3 servers goes down. when we restart the server only the store, the system attendant and the active directory topology services can be started the other services fail without error.. (even with set-event... -level expert) the only error in the event viewer is about some servers in one of the domains of the forest. (the domain is offline due to connection problems) the other 9 domains of the forest are ok. the error is: ------------------------------------------------- Process MSEXCHANGEADTOPOLOGYSERVICE.EXE (PID=3308). Error ERROR_TIMEOUT (0x800705b4) occurred when DNS was queried for the service location (SRV) resource record used to locate a domain controller for domain agronet.mynet.netThe query was for the SRV record for _ldap._tcp.dc._msdcs.mynet.net. The DNS servers used by this computer for name resolution are not responding. This computer is configured to use DNS servers with the following IP addresses:10.12.1.5110.12.1.110.12.1.50 . Verify that this computer is connected to the network, that these are the correct DNS server IP addresses, and that at least one of the DNS servers is running.For information about correcting this problem, type in the command line:hh tcpip.chm::/sag_DNS_tro_dcLocator_messageB.htm For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. ------------------------------------------------------ any idea ???

Hi, Looks like serverhas some network related issues Check RSS and TCP chimney Offload settings which are on in Windows 2003 SP2 by default and which normally causes network issues. Windows 2003 Scalable Networking pack and its possible effects on Exchange http://msexchangeteam.com/archive/2007/07/18/446400.aspx You may experience network-related problems after you install Windows Server 2003 SP2 or the Scalable Networking Pack on a Windows Server 2003-based computer http://support.microsoft.com/kb/936594 Run DCDIAG & Netdiag on the server and check if it indicates any issues. Check network card speed and verify that it has same as switch(normally Duplex to 100Mb full)otherwise set it manually. You may also check the network card driver update if it has any older version.

i uninstall the security rollup for exchange with seeervice pack 1.. kb949870 the wsus patches shutdown all the servers .. we dont know why ... maybe later i download the update directy from microsoft i retry .... maybe... thanks to everybody .. manuel