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Old 07-04-2016, 06:58 AM   #1
sarahlin
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centos 7, sendmail error: dsn=4.0.0, stat=Deferred: Connection timed out


Hi there,

i have install sendmail on my centos 7, on a server with subdomain.domain.com, I can receive mail send from the sever to user1@subdomain.domain.com, and user2@domain.com; but when i try to send mail outside the domain.com, it failed with "dsn=4.0.0, stat=Deferred: Connection timed out" error;

Anyone have any ideas what i miss on the server/sendmail configuration?

thanks.
 
Old 07-04-2016, 08:10 AM   #2
TenTenths
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DNS?
Outbound firewall?
Being blocked at the receiver end?
 
Old 07-05-2016, 08:31 AM   #3
sarahlin
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Quote:
Originally Posted by TenTenths View Post
DNS?
Outbound firewall?
Being blocked at the receiver end?
new to admin job, wondering if anyone can tell me more detail about the steps i should run to check, and what's the expected outcome from the check;

the server is an external facing box, www running on it, so i am kind of afraid to mess around the box.

thank you in advance.
 
Old 07-05-2016, 09:24 AM   #4
ardvark71
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Location: Oregon, USA
Distribution: Lubuntu 14.04, Windows Vista
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Quote:
Originally Posted by sarahlin View Post
new to admin job, wondering if anyone can tell me more detail about the steps i should run to check, and what's the expected outcome from the check;

the server is an external facing box, www running on it, so i am kind of afraid to mess around the box.
Hello and welcome to the forum

By "admin job," do you mean system administrator? If so, not to try and sound rude in any way but you may be way in over your head from what you described. The things that TenTenths described are not only common aspects to the job but involve software and typically do not require you to do anything to the hardware.

On the firewall side of things, here are some pages that might be of help...

https://www.linode.com/docs/security...alld-on-centos

http://www.liquidweb.com/kb/how-to-s...d-on-centos-7/

http://www.liquidweb.com/kb/how-to-s...d-on-centos-7/

http://www.codero.com/knowledge-base/questions/377/

http://www.tecmint.com/firewalld-rules-for-centos-7/

Also, you should be able to open a terminal and find out the what the rules are for your firewall by using these commands, as mentioned in the first link above...

Code:
firewall-cmd --direct --get-all-chains
Code:
firewall-cmd --direct --get-all-rules
Regards...

Last edited by ardvark71; 07-05-2016 at 09:33 AM. Reason: Corrections/Added link.
 
Old 07-05-2016, 12:53 PM   #5
sarahlin
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Quote:
Originally Posted by ardvark71 View Post
Hello and welcome to the forum

By "admin job," do you mean system administrator? If so, not to try and sound rude in any way but you may be way in over your head from what you described. The things that TenTenths described are not only common aspects to the job but involve software and typically do not require you to do anything to the hardware.

On the firewall side of things, here are some pages that might be of help...

https://www.linode.com/docs/security...alld-on-centos

http://www.liquidweb.com/kb/how-to-s...d-on-centos-7/

http://www.liquidweb.com/kb/how-to-s...d-on-centos-7/

http://www.codero.com/knowledge-base/questions/377/

http://www.tecmint.com/firewalld-rules-for-centos-7/

Also, you should be able to open a terminal and find out the what the rules are for your firewall by using these commands, as mentioned in the first link above...

Code:
firewall-cmd --direct --get-all-chains
Code:
firewall-cmd --direct --get-all-rules
Regards...

thank you for the links, i will check them out..

per "Admin job", which is not my main job, just it happen the sendmail doesn't work on the box, i have to find out how to get it work.. i am a software developer. there are just too many things to understand, and learn!
 
Old 07-05-2016, 01:36 PM   #6
ardvark71
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Quote:
Originally Posted by sarahlin View Post
i am a software developer.
Ah, that makes more sense now.

Regards...
 
  


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