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Unable to Ping between 2 servers

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Friday, September 23, 2011 12:33 PM

I have 3 servers connected to same switch, the net  id is same for all the 3,  all the switch gets ping with gateway, but it's not pinging properly with each other.

1. server1 unable to ping with server2 & server3

2. server2 unable to ping with server3 alone

3. server3 unable to ping with server2 alone

All replies (6)

Friday, September 23, 2011 1:35 PM

First, make sure that you are troubleshooting this by using the PING command by IP.  Verify the TCP/IP configuration for each host to ensure that the subnet mask is correct.  Next, validate that the local firewall on each system is not the cause of the failed communication among the hosts.

For example, if server1 can PING server3, but server3 cannot PING server1 (by IP), that is not an indication of a network issue, but more likely something filtering the traffic such as a firewall on one of hte servers.  The reason is that since server1 can PING server3, you have established that ICMP packets are flowing both ways when originating from server1.

 

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Friday, September 23, 2011 2:28 PM

Make sure you have check any third party internet sheild/antivirus/firewall programs to see if they are blocking your network functionality, they are usually the culprit.  Also check your Windows Firewall settings and see if you have disabled icmp:P Advice offered, If you need more help it is advised to seek the council and advice of paid professionals. The answer is always 42, or reboot.

Friday, September 23, 2011 9:33 PM

In addition to checking firewalls and security software, try to connect using a UNC using the NetBIOS name, from each server to each other server, such as:

If that doesn't work, then try by FQDN:

If that works, but the NetBIOS names don't, then it's a NetBIOS name resolution issue as well as a firewall (Windows or 3rd party security tool) is blocking ICMP.

If the above does not work, then try by IP:

If the NetBIOS method doesn't work (NetBIOS resolution issue), and the FQDN doesn't work (DNS issue, which is more severe of an issue), and IP works, then we need to take a look at an unedited ipconfig /all from the three DCs as well as any event log errors that may exist to assist in determing the issue.

Ace Fekay
MVP, MCT, MCITP EA, MCTS Windows 2008 & Exchange 2007 & Exchange 2010, Exchange 2010 Enterprise Administrator, MCSE & MCSA 2003/2000, MCSA Messaging 2003
Microsoft Certified Trainer
Microsoft MVP - Directory Services
Complete List of Technical Blogs: http://www.delawarecountycomputerconsulting.com/technicalblogs.php

This posting is provided AS-IS with no warranties or guarantees and confers no rights.

Saturday, September 24, 2011 3:37 PM

from all the server firewall enable the icmp request3.

tip-just share a file from servers.it will allow you icmp also.

if you have antivirus you have to trust your network(kaspersky,symantec)

 

 

Darshana Jayathilake

Sunday, January 5, 2014 3:34 AM

Hi All,

In the same way as explained, i have a X server which seems to be pinging and accessible through RDP from few servers and unable to do the same in other servers.

I see that ICMP for private only is disabled.

Network has cleared saying there is no firewall enabled.

As suggested tried to map the drives with the server name and it was showing cannot access error.

\server1\c$

when tried with below naming convention, i was able to map the drives successfully. But still the server is not pinging on both the sides

\server1.domain.local\c$

Requesting suggestions on the above to fix the issue.

Thanks.

Tuesday, January 7, 2014 6:41 AM

If you can successfully map a drive using \server1.domain.local\c$, then that tells me that DNS resolution is working fine.

If you can't map using NetBIOS with \server1\c$, then it tells me there is a firewall rule somewhere blocking that capability.

Did you check your antivirus as others have suggested? Antivirus apps are one of the causes of communication issues in corporate infrastructures.

If you haven't already done so, please try disabling the antivirus security features between two of the machines that can't ping or map using NetBIOS. If possible, uninstall it, which is a better test, because some of them have components that are still active even if you had disabled it.

Ace Fekay
MVP, MCT, MCITP/EA, MCTS Windows 2008/R2 & Exchange 2007, Exchange 2010 EA, MCSE & MCSA 2003/2000, MCSA Messaging 2003
Microsoft Certified Trainer
Microsoft MVP - Directory Services
Technical Blogs & Videos: http://www.delawarecountycomputerconsulting.com/

This post is provided AS-IS with no warranties or guarantees and confers no rights.