Solved

Cannot Ping Mail server IP address

Posted on 2011-02-15
9
1,455 Views
Last Modified: 2013-11-13

I wonder if you might have an answer for me on this question.  
 
I can ping the IP address of our mail server from my laptop no problems.  However I can't ping our mail server IP address from our server which is in a data centre. This is strange because I can ping other IP's from that server that is in the datacentre, I can also ping domain names like www.google.com from it.
Any ideas on what the problem might be?  The firewall has ports 25 and 110 open.  The mail server is outside the datacentre too.

thanks
Harold
 
0
Comment
Question by:hcg100
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 4
9 Comments
 
LVL 7

Expert Comment

by:oriziv
ID: 34904021
Since you have a fire-wall, The first thing I would have check is that the fire wall doesn't block ICMP (the protocol which ping uses)
0
 

Author Comment

by:hcg100
ID: 34904184
It is not the firewall, because I can ping other external IP addresses and domains with no problem from the server.
0
 
LVL 7

Expert Comment

by:oriziv
ID: 34904194
1. Make sure there's no specific rule blocking ICMP to this server.
2. Make sure there's no local fire-wall on the mail server that blocks ICMP
0
When ransomware hits your clients, what do you do?

MSPs: Endpoint security isn’t enough to prevent ransomware.
As the impact and severity of crypto ransomware attacks has grown, Webroot has fought back, not just by building a next-gen endpoint solution capable of preventing ransomware attacks but also by being a thought leader.

 

Author Comment

by:hcg100
ID: 34912486
Once again, it is nothing on the mail server either, as I can ping that successfully from other locations, outside the data centre.  Try pinging 202.174.104.20.  
When I am logged onto the server in the datacentre I can ping sites like www.google.com but I can't ping the IP address above.
Thanks
0
 
LVL 7

Expert Comment

by:oriziv
ID: 34913656
Hi,

Since IP 202.174.104.20 is generally responding to ping, there's something on your network infrastructures that blocks ICMP.
Run tracert -d 202.174.104.20 from your server command line console. this should give you a list of hops. one of these hops blocks your ping.
0
 

Author Comment

by:hcg100
ID: 34923887
Hi
Interesting - tracert shows timeouts as the message enters the data centre where the mailserver is (which is another city actually).  This is at the 11th hop.

I have actually overcome the issue by installing a mail server on our service in our datacentre. So its a bit of a moot point, but i would still like to understand what was happenning!

thanks
0
 
LVL 7

Accepted Solution

by:
oriziv earned 250 total points
ID: 34937191
This means your ping got out of your site, routed to your data-center and blocked there.
There should be some software fire-wall or infra-structure that blocks ICMP.
possibilities are most likely:
1. fire-wall at your data-center back-bone
2. some security module on one of your switches or routers at the data-center
3. Some software fire-wall on your mail server's operating system or on its anti-virus program.
0
 

Expert Comment

by:philmike
ID: 34955638
If ICMP is blocked, it will stop your ping.

You can try telneting to port 25 of the SMTP mail server.
If you get a connection the server is available.
If not your probably not getting mail.
0
 

Author Closing Comment

by:hcg100
ID: 35361562
It turns out the mail server provider had blocked our server IP address for some reason.
Thanks
0

Featured Post

On Demand Webinar - Networking for the Cloud Era

This webinar discusses:
-Common barriers companies experience when moving to the cloud
-How SD-WAN changes the way we look at networks
-Best practices customers should employ moving forward with cloud migration
-What happens behind the scenes of SteelConnect’s one-click button

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Local Continuous Replication is a cost effective and quick way of backing up Exchange server data. The following article describes the steps required to configure Local Continuous Replication. Also, the article tells you how to restore from a backup…
As cyber crime continues to grow in both numbers and sophistication, a troubling trend of optimization has emerged over the last year.
In this video we show how to create a mailbox database in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center. Navigate to the Servers >> Data…
Nobody understands Phishing better than an anti-spam company. That’s why we are providing Phishing Awareness Training to our customers. According to a report by Verizon, only 3% of targeted users report malicious emails to management. With compan…

705 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question