We help IT Professionals succeed at work.

How to troubleshoot exchange server connectivity issue?

896 Views
Last Modified: 2012-05-10
user has exchange server 2003 in domain environment. Setup a user and email. The user can send out email but cannot receive any email. the NDR is
A message that you have sent could not be delivered to one or more recipients.  This is a permanent error.  The following address failed:
 <test@abc.com>: 550 "

I read this article http://support.microsoft.com/kb/153119. My questions:
1. How does each command can help me find out the problems?
2. and to telnet, I need to find out the exchange server fqdn or ip address, but it seems I cannot just telnet abc.com as sometime the exchange server not in the same location as exchange server. How can i find out the location of exchange server?
 
Comment
Watch Question

evanmcnallyIT Consultant
Commented:
This one is on us!
(Get your first solution completely free - no credit card required)
UNLOCK SOLUTION

Author

Commented:
thank you very much! But some of my clients they also use mxlogic, it's kind of email filter service. So email has to be delivered to mxlogic first and then passed to their exchange server. So in this case, I will never be able to find out the real exchanger server fqdn/ip. i always get the fqdn of mxlogic, something like abc.com.inbound15.mxlogic.net. is there a way to find out?


So for the telnet, do you think some firewall able to just block telent but still leave port 25 open?
evanmcnallyIT Consultant
Commented:
This one is on us!
(Get your first solution completely free - no credit card required)
UNLOCK SOLUTION
This is a handy page.
http://network-tools.com/

Select the email verification option and enter a valid SMTP address.
This will show MX record lookups and SMTP conversation - easier than typing all those SMTP commands.

Author

Commented:
>Are you sure the NDR is not being generated by mxlogic rather than the server itself?  Some email filtering services require a user to be configured on their side before they will forward to the real server.

It did sent out NDR report. but in order to use the smtp command, I still need to find out the real exchange server fqdn/ip right?

>An ISP would be blocking port 25 not standard telnet (which is port 23).  This is to stop viruses on home PCs from sending spam via smtp/email.

if they block port 25, how can home user to send out email? if it's a pop account, user use pop3 to download email and use smtp to send out email... not correct?

>business accounts do not normally have port 25 blocked because the ISP assumes you will block it yourself on your own router.

will any company block smtp port if they have mail server? mail server always need incoming and outgoing port 25 open right?

IT Consultant
Commented:
This one is on us!
(Get your first solution completely free - no credit card required)
UNLOCK SOLUTION

Author

Commented:
I see... I think it sounds more like a restriction on port 25 rule not blocking the port.
So basically I think you mean is port 25 at client's network not blocked, it's just it can only connect to their ISP mail server not anything else. Is that correct? so in this case, they will not be able to run telnet test to other smtp server from their network??

And in previous reply, you told me that I can find out ip or fqdn from the server itself. I did that, but when I run the telnet in other location, I receive could not open connection to the host, on port 25: connection failed.
I got NDR from mxlogic - 550 5.1.1 User unknown So obviously I need to check mxlogic first. But I also want to try to telnet to the real exchange server, so what is wrong with the connection as I already found out the real exchnage ip??

Author

Commented:
hi evanmcnally, any idea?

Gain unlimited access to on-demand training courses with an Experts Exchange subscription.

Get Access
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Empower Your Career
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE

Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions
Unlock the solution to this question.
Join our community and discover your potential

Experts Exchange is the only place where you can interact directly with leading experts in the technology field. Become a member today and access the collective knowledge of thousands of technology experts.

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

OR

Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.