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Unable to Ping across different subnet with Windows 7 workstation and Window 2003 server R2

Posted on 2011-02-25
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Last Modified: 2012-05-11
I just installed a MPLS connection between my two offices each with a private network with different subnets.  Previously I had a VPN setup to connect the two networks.   Each network is bridged by a managed switch furnished by Telcom which translates the different subnets between the two offices.

Traffic is transfering perfectly with all of my Windows XP workstations on both sides of the network.  XP workstations are pingable and and network discovery works.  My only problem is the one and only Windows 7 workstation and Windows 2003 server R2 on one side of the network can not ping or browse the other network.  They worked before with the VPN.

It seem as if that would be a security setup issue with Windows 7 and Windows Server 2003 R2.   Where do I start?  How do I troublshoot?
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Question by:JScho10
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by:JBond2010
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From the command prompt type netsh winsock reset
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by:JScho10
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Thanks for the sugestion.  No Joy.  Tried on Windows 7 workstation.  Ran command and restarted.  Still not working.  

BTW, I have a long wait at startup now.  Could be my mapped drives that won't connect across the network?
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by:JBond2010
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Have you checked the bindings TCP/IP? Also, this could be an invalid ARP entry in the routing table of your Router/Firewall. You could try flushing the ARP cache on the Router. I have seen this happen before where I had to flush the ARP cache.
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by:JBond2010
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It would also be a good idea to check DNS on the Server to make there a valid A Record for the Windows 7 machine.
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by:JScho10
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No luck yet.  Flushed ARP on Router/Firewall. Flushed DNS on Server.  Able to ping the W7 workstation from both networks.  How/What do I check TCP/IP bindings?

Why both W7 and Windows Server 2003 machines and not XP machines?
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by:JBond2010
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Did you check the antivirus on the Windows 7 machine? I would try uninstalling the antivirus and then reboot the Windows 7 machine and see then can you ping.
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by:JScho10
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Kasperky is off. Firewall is off.  No ping.   How do I check TCP/IP bindings?
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by:JBond2010
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Is the Windows 7 firewall blocking ICMP requests? Check this on the machine to make sure this is not the case.
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by:JBond2010
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Have you checked on your Router/Firewall that the VPN is connected?
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by:JScho10
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<Is Windows 7 firewall blocking ICMP requests>  All Windows 7 firewall settings are disabled.  Kaspersky is off.
<Have you checked on your Router/Firewall that VPN is connected>  There is no VPN, just a managed switch transferring across MPLS.  Also remember XP machines work fine.  Something about W7 and Windows 2003 R2 machine.
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JBond2010 earned 500 total points
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I think the problem is to do with the configuration of the managed switch. You say this is a managed switch as oppose to a unmanaged switch! I thing the managed switch is blocking off connection with the Windows 7 machine and the Windows 2003 server.
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by:JScho10
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I found the problem.  It was with my Router.  There were two extraneous command settings trying to route the subnet traffic on the W7 and S2003 machines through the WAN and not the MPLS router.  Thank you for your help, you got me in the correct direction.
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by:JScho10
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Thank you for being so patient.
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