Hi, I have a server 2003 r2 with 12 IP's on the same NIC. The server was running just fine for the last 3 yeard but suddenly IP's except the primary IP on the NIC get unaccessible. We cannot ping the secondary IP's on the server and cannot connect to any services running on these IP's. But the primary IP works without problems. When I restart the server everything is fine again for a couple of hours. Or I go to the TCP/IP properties and change the primary IP to one of the secondary IP's and ping an IP on internet and then change the primary IP to the previous one and that specific secondary IP I changed is running again. If I do it for all the IP's it's OK without restart. I hope I could explain the issue.. What might be the problem?

You need to provide more information. Why do you need more than one IP? Where are you accessing this server from? Please post the IPCONFIG/ALL. Do you see any error message in the event log? “can’t access the system” -> can you ping server using IP address? Santhosh Sivarajan | MCTS, MCSE (W2K3/W2K/NT4), MCSA (W2K3/W2K/MSG), CCNA, Network+ Houston, TX Blogs - http://blogs.sivarajan.com/ Articles - http://www.sivarajan.com/publications.html Twitter: @santhosh_sivara - http://twitter.com/santhosh_sivara This posting is provided AS IS with no warranties, and confers no rights.

Thanks for your reply.. It's a web server with multiple secure web sites so we need multiple IP's normally I can ping all the IP's but when there is problem only the first IP on the NIC can be pinged the others do not reply. When I restart it's all OK again. Or change the primary IP to one of the secondaries the IP starts to reply to ping. Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Broadcom NetXtreme Gigabit Ethernet #2 Physical Address. . . . . . . . . : 00-1A-4B-0A-86-AE DHCP Enabled. . . . . . . . . . . : No IP Address. . . . . . . . . . . . : XX.106.17.158 Subnet Mask . . . . . . . . . . . : 255.255.255.240 IP Address. . . . . . . . . . . . : XX.106.17.157 Subnet Mask . . . . . . . . . . . : 255.255.255.240 IP Address. . . . . . . . . . . . : XX.106.17.156 Subnet Mask . . . . . . . . . . . : 255.255.255.240 IP Address. . . . . . . . . . . . : XX.106.17.153 Subnet Mask . . . . . . . . . . . : 255.255.255.240 IP Address. . . . . . . . . . . . : XX.106.17.152 Subnet Mask . . . . . . . . . . . : 255.255.255.240 IP Address. . . . . . . . . . . . : XX.106.17.151 Subnet Mask . . . . . . . . . . . : 255.255.255.240 IP Address. . . . . . . . . . . . : XX.106.17.146 Subnet Mask . . . . . . . . . . . : 255.255.255.0 IP Address. . . . . . . . . . . . : XX.106.17.150 Subnet Mask . . . . . . . . . . . : 255.255.255.240 Default Gateway . . . . . . . . . : XX.106.17.145 DNS Servers . . . . . . . . . . . : XX.106.1.4 XX.106.2.4 NetBIOS over Tcpip. . . . . . . . : Disabled

The problem is solved. The ISP changed the switch and our problem is gone.. Thanks

Thanks for the update. Santhosh Sivarajan | MCTS, MCSE (W2K3/W2K/NT4), MCSA (W2K3/W2K/MSG), CCNA, Network+ Houston, TX Blogs - http://blogs.sivarajan.com/ Articles - http://www.sivarajan.com/publications.html Twitter: @santhosh_sivara - http://twitter.com/santhosh_sivara This posting is provided AS IS with no warranties, and confers no rights.