Network connectivity issue with in Windows servers

Posted on 2013-06-02
Last Modified: 2013-08-07

I am facing weird problem in my network environment.

I have windows 2008 single forest & domain model. Having windows 203 & 2008 servers all are in the same data center and same network(same subnet mask). For the last 2 months I m facing the problem as from the server A- unable to connect B -


when I try to ping server B from Server A it is giving the error as

ping server B

Pinging with 32 bytes of data:
Reply from Destination host unreachable.

But from the server B, I am able to connect Server A. but from the both servers I can able to connect other servers. Only Server A having the issue with B. there is no other issue.

Some one can you help on this. Where it went wrong?
Question by:Haribaskaran
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Author Comment

ID: 39215263
By default firewall in OS has been disabled in all servers. All the servers are in the same data center. there is no firewall in between them. It was working well earlier.

Expert Comment

ID: 39215346
I assume that even after a reboot the problem still exists. What about reboot of network infrastructure?

Author Comment

ID: 39215398
Yes. I have rebooted both servers. still same issue. But Network side we havenot done any reboot since it involved lot of outage for other production servers.
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LVL 25

Expert Comment

by:Tony Giangreco
ID: 39215477
If they are both DC's, run the Repadmin /showrepl commands and make sure replication runs properly.

If they are not both DC's, on the 1st server, edit the host file and add the 2nd server's IP and name. Then edit the host file on the 2nd server and add the IP and name of the 1st server.

This has worked for me in the past.

Expert Comment

ID: 39215935

Based on your description it seems only like firewall issue.

Server A -> Server B = Not Working
Server B -> Server A = Working

The Servers hosted in a physical servers or on VMs?

Can you please check firewall once again in Server A and also check whether IPv6 is enabled,if not used please disable IPv6 and check again.

Let me know :)

Author Comment

ID: 39216818
Confirmed the firewall has been disabled.

Server A is VM and Server B is physical.

I installed the netmon in both servers and started capturing the packets. Now i can able to connect Server B from server A. Not sure netmon did some magic. But still the same issue in other servers there this netmon trick not worked. I beleive something strange.
LVL 10

Expert Comment

ID: 39216846
Since 1 is a VM and the other physical, I would look at the VM's virtural switch or router configuration.  If you do a Tracert from one to the other where does the trace stop??  Depending on your VM host the VM switch can be configured for VM network access only, VM network to VM host access only, or VM network to LAN network access.

Author Comment

ID: 39216900
Here the outout I am getting to try to tracert from server A
G:\>tracert server B

Tracing route to []
over a maximum of 30 hops:

  1     *        *        *     Request timed out.

from Server B to Server A tracert result is

G:\>tracert ServerA

Tracing route to []
over a maximum of 30 hops:

  1    <1 ms    <1 ms    <1 ms []

Trace complete.
LVL 25

Expert Comment

by:Tony Giangreco
ID: 39300151
Have you resolved this issue? Any feedback?

Author Comment

ID: 39303498
No the issue still exisits. No resolution found so far.

Accepted Solution

Haribaskaran earned 0 total points
ID: 39378754
After reconfigure the Port channel between the Blade enclosure and core switch this issue was resolved.

Author Closing Comment

ID: 39388631
No other solution found and finally we did this option with little it outage to production envirnment.

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