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I have 2 computers on the network (Computer A & B). There are also other computers on the network.

From Computer A I am able to ping all other computers on the network except Computer B. Similarly from Computer B, I am able to ping all computers on the network except Computer A. And I am able to ping Computer A & Computer B from other machines in the network.

It looks like just Computer A & Computer B won't talk to each other for some reason. I have done the following and still have problems:

  1. Re-installed Operating systems in both Computers. Computer A was upgraded to Windows Server 2012 from Server 2008 R2. Windows Server 2008 R2 was re-installed in Computer B.
  2. Firewall is turned off in both computers

Does anybody know why this would happen?

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Switch ?LAN ? Network config ? –  Ofiris Apr 25 '13 at 16:03
    
Both are connected to LAN –  Pal R Apr 25 '13 at 16:04
    
Whats their subnet configurations ? –  Ofiris Apr 25 '13 at 16:06
    
255.255.255.0. Is that what you are asking? –  Pal R Apr 25 '13 at 16:08
1  
After attempt to connect, look at ARP on both hosts. arp -a –  mmv-ru Apr 25 '13 at 16:13
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