asked on Win 2008 server lost access to network router
Have a Win2008 server in a small LAN. It is running as a domain controller and is also running an email server. LAN is connected to Internet via a ZyWALL router (192.168.1.1), and it has worked well for a long time. Yesterday I noticed that the server seemed to not access the Internet anymore (mail server failed dns lookups to external dns). Inbound emails work fine (the server responds to external requests).
Investigation showed that the server doesn't "see" the router.
I'm able to ping the router from other devices in the LAN. From the server I'm able to ping all other addresses - except the router address. From PCs in the LAN I'm able to ping the server's IP address. This tells me that there may be something that prevent the server to access the router. Have checked the routing tables, and the address 0.0.0.0 is routed to the correct address (192.168.1.1).
Expect that there may be some process or service that prevents the server from accessing the rouer's IP addres, but I'm not able to fine what it is. The server is running Malwarebytes to prevent attacks and malware. Have tried to disable it, but not sure if I've done it right.
Are there any other steps to take in order to solve this problems? Thanks!
Investigation showed that the server doesn't "see" the router.
I'm able to ping the router from other devices in the LAN. From the server I'm able to ping all other addresses - except the router address. From PCs in the LAN I'm able to ping the server's IP address. This tells me that there may be something that prevent the server to access the router. Have checked the routing tables, and the address 0.0.0.0 is routed to the correct address (192.168.1.1).
Expect that there may be some process or service that prevents the server from accessing the rouer's IP addres, but I'm not able to fine what it is. The server is running Malwarebytes to prevent attacks and malware. Have tried to disable it, but not sure if I've done it right.
Are there any other steps to take in order to solve this problems? Thanks!
Windows Server 2008Networking ProtocolsRoutersInternet Protocols
Last Comment
Olaf Berli
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ASKER
Good idea! Put in an older ZyWall 2+ and it works just as it should. Server pings the router ok and the server is able to access the internet. Need to find out why that other ZyWall didn't respond.... Haven't seen any setting that should "ban" local units.... Anyway - thanks a lot!
ASKER
Thanks!
wireshark.pdf