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Windows 2003 Server One Way Ping

We have a Windows 2003 server with 2 NICs; one NIC is for our client access and general network connectivity. The second NIC is used for private communication between other servers. The second NIC doesn't have a gateway defined, nor has it ever. The first NIC has a gateway and DNS servers defined.

This server can ping everything on our network; however no clients or other servers can ping this server. We have disabled AV protection and confirmed there are no firewalls blocking traffic.

This server, and other servers similarly configured, work just fine. We did not suffer from any power outage or anything out of the norm so we don't have a cause for this incident.

Thoughts?
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pitchford
Asked:
pitchford
1 Solution
 
Salah Eddine ELMRABETCommented:
Hi,

Is the IP addresses on both NICs are on different subnets or on the same network? if on the same network the server will not know from witch interface send the echo reply packets!!

to make sure if it's not the case (having IP in different range) try to disable the second NIC and keep the one connected to clients side active and try the ping.

Regards.

Salah
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krzyinsaneCommented:
How is everything connected? Router, switch, hub?
How are you pinging?  Name and/or IP?
Can your client workstations access any resources on this server?
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pitchfordAuthor Commented:
NICs are on different subnets. NIC1 is on a 10. network while NIC2 is on a 172 subnet. I've tried disabling one, but it still fails.
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Salah Eddine ELMRABETCommented:
Hi,

could you please explain you architecture?

BR
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pitchfordAuthor Commented:
It is a large enterprise with multiple VLANs and multiple servers. This is a physical server and on NIC2 we have it attached to a switch with 8 other servers. NIC1 it attached to the core switch with the rest of the enterprise.

We've removed all AV protection (in case the AV decided to enable the firewall), deleted the NIC adapters and reconfigured; still experiencing the trouble. Windows Firewall services are disabled.

This actually just started happening on Friday evening when no one was around; so whatever the issue it just started on its own.
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pitchfordAuthor Commented:
Scott, ICMP is allowed.
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pitchfordAuthor Commented:
I don't understand it, but we attempted to enable the firewall but got an error abut a dependency not started. I checked and foudn the Windows Management Instrumentation service was disabled. I enabled WMI then enabled Windows Firewall, confirmed the firewall was off (as per our GP). All is working now.

The only thing I can think of is that GP was pushing the policy and with WMI and/or Firewall services not running it errored and caused this error? Sounds a little crazy but its the only thing I can think of at the moment...

Thank you all for your assistance!
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pitchfordAuthor Commented:
Found solution myself...
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