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Windows 2008 R2 connectivity problem

Posted on 2010-11-23
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Last Modified: 2012-05-10
Hi All,

I have a very strange problem - fo some reason I cannot ping or connect to a network switch from any of our Windows 2008 R2 machines.

The Windows 2008 (non-R2) machines can ping it fine as can any of the Windows 2003 and XP machines.

Any ideas why Windows 2008 R2 machines would not be able to contact a particular device on the network?!

Thanks
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Question by:robclarke41
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Expert Comment

by:Ady Foot
ID: 34197820
Do you have IPv6 enabled on the 2008 R2 machines?  If so try disabling it and try again.  Seen something like this before...
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by:robclarke41
ID: 34197833
Yep that was the first thing I checked.
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by:Krzysztof Pytko
ID: 34197837
Check if you have set up Default Gateway properly on Windows 2008 R2 (if they are in different subnet(s)) or DNS settings if you are using ping by switches DNS name

Regards,
Krzysztof
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by:robclarke41
ID: 34197869
The default gateway is definitely correct and it is in the same subnet.  I am pinging the switch by IP address.  All our servers are setup in the same way but its only the 2008 R2 machines that cannot connect to this particular switch!
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by:Ady Foot
ID: 34197887
Are all the Server 2008 R2 physical machines using the same hardware?
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by:Ady Foot
ID: 34197888
Incidentally what switch is it?
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by:Krzysztof Pytko
ID: 34197968
Check if domain profile of Windows Firewall is disabled or has added allow rule for ICMP.

Regards,
Krzysztof
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by:Krzysztof Pytko
ID: 34197974
of course Windows Firewall on Windows 2008 R2 servers :)
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by:robclarke41
ID: 34198058
It's actually 3 switches they are all 3com superstacks and the R2 servers can see others of the same model.  The R2 firewall is disabled all 3 layers!
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by:Ady Foot
ID: 34198080
Just a question that's just dawned on me.  Can the 2008 R2 servers connect to the network otherwise?  I.e. can they ping other machines and can those other machines ping the servers?  If so then what does it matter if you can't ping the switch?  If the switch is managed, can you access the management site from the servers?
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by:robclarke41
ID: 34198210
The R2 machines do have full connectivity with the rest of the network, no problems there (one is a file server). Good question why do we need to ping the switch? The reason is that one of the servers is a network monitor running Insight manager, Spiceworks and ServerPA monitor so monitors these switches and alerts us to any issues.

To answer you other question we cannot access the management console from the R2 servers either.  They are standard L2 LAN switches with an IP assigned gor monitoring and management.
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by:Ady Foot
ID: 34198319
You don't have any kind of security running on the switches which is preventing the R2 servers from connecting do you?  
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by:robclarke41
ID: 34198335
No nothing, just bog standard switches same as all the others, I'll double check tomorrow.
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by:robclarke41
ID: 34198336
No nothing, just bog standard switches same as all the others, I'll double check tomorrow.
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by:robclarke41
ID: 34198339
No nothing, just bog standard switches same as all the others, I'll double check tomorrow.
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by:robclarke41
ID: 34205941
Just checked the switches guys, no security setup.
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robclarke41 earned 0 total points
ID: 34300247
Arp cached needed clearing
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by:robclarke41
ID: 34332921
Arp cached needed clearing
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