Hi All, I having an exchange 2000 server (SP3) which migrated from exchange 5.5, the operating system is running on windows 2000 with AD. And is connect using ISDN line with the config of ETRN. I had facing two problems, 1). When the ISDN line down or not active the log file is increasing every one mins. 2). When the ISDN line down or not active those client cannot logon to exchange server using microsoft outlook. Hope to hear from you. TQ. Patrick Goh I.T Engineer NTT MSC SDN BHD No.43000, Jalan APEC Cyberjaya Selangor 63000 Malaysia Office: 603-83112030 Mobile 012-2151000 Email : patrickgoh@xxxxxxxxxx WebSite: http://www.nttmsc.com.my Add this card to your address book --------------------------------------------------------------------------------