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Email server 450 host down

Posted on 2004-04-06
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Last Modified: 2007-12-19
We are running Groupwise 6.5 on a windows 2000 server.  It has had no problems until about one month ago.  We keep seeing the follwoing message in our Groupwise Internet Agent logs:

11:50:02 10 DMN: MSG 413 Send Failure: 450 host down (yahoo.com)

The host down has been several different domains but one has been an external email address that we use as a back up email account.  We have contacted the provider and they say everything is working ok on their end and it must be our problem.  

Additionally even though the email server reports the host down, the email sent to that domain does get to it, occasionaly.

can someone help out.??

Jon
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Question by:stewartje
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Expert Comment

by:waybadmojo
ID: 10767789
Your mailserver looks up the DNS entry available to it for yahoo.com and then attempts to contact this address to see if the address is available. If the address that your GWIA discovers via MX lookup is down or unavailable at that moment, you will see a 450 host down error (which is true).

Your server will then query the next available MX record for yahoo.com and attempt to send to that address until all the MX records it can find are exhausted. At that point your message is deferred and will delivery will automatically be re-attempted for 4 days (I think this is the default for 6.5). After 4 days the message is discarded and an undeliverable message is returned to the sender.

This is functioning as designed, and is perfectly normal. You are merely seeing the console logging in action.

-Mojo
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Author Comment

by:stewartje
ID: 10790463
mojo,

i was afraid that was going to be the answer.  can you shed some light on on why only two domains, an email provider for our back up email and now our own domain is reporting the following:

421 SMTP service not available, closing transmission channel and then 450 host down. (domain XXX.XXX)

Is it possible that UUNet, our T1 provider,  does not have the correct MX record for xxxx.net and XXXX.com?  How can Groupwise report that our own domain is down?  

I can accept your answer I just want to make sure that I am explaining our situation properly.  Thanks

Jon
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Accepted Solution

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waybadmojo earned 1400 total points
ID: 10792660
The easiest way to ensure that your own host is never down is to add a statis entry for YOURDOMAIN.COM in the server hosts file, this way it never has to rely upon DNS service to get an IP address for your domain.

An example:
MYDOMAIN.COM         192.168.1.33

An entry like this tells your server to use that address every time it sees that particular domain. You can do this for as many domains as you like, but know that if one of them ever changes, you will have to update this file manually (since DNS is no longer involved). Another downside is that this is difficult for large domains which use multiple MX records like yahoo.com or msn.com.

Give statis host entries a try and see if your problem gets better.

-Mojo
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Author Comment

by:stewartje
ID: 10806560
Mojo,

Ok.  I am confused I thought the hosts file is nto used anymore.  I have an entry in my local DNS, mydomain.com and is set to my Server LAN IP.  
Is this what you suggest I do?

jon
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LVL 8

Expert Comment

by:waybadmojo
ID: 10862720
Sorry for my tardy response, I've been a tad busy lately.

The HOSTS file modification will stop your server from ever having to look up its own domain. I ALWAYS put this entry in for my mail servers. Why waste the time doing a lookup when this box IS the domain I'm trying to look up? I move a LOT of mail through my gateways, so every few milliseconds I can keep makes me that much more efficient.

Your DNS setup is correct, I am not faulting it, I merely prefer this method for speed and to ensure that my mail server ALWAYS knows that it is MYDOMAIN.COM regardless of whether or not I lose connectivity to my DNS server and my DNS is busy.

Try adding an entry and see if your problems get better, if it does not, then remove it and we can look for something else.

-Mojo
0
 

Author Comment

by:stewartje
ID: 10870568
Ok.  Thanks.  I added the domain to my hosts file.  

Can you offer advice as to where I could locate a good forum or usenet for Groupwise?   I have lots of questions and have not been able to find a group that can answer them.

jon
0
 
LVL 8

Expert Comment

by:waybadmojo
ID: 10871695
Novell post their own forums and they are trolled by the sysops for each product.
You will generally get better answers to your questions here at EE, but the Novell forums are free.

The server for the Novell forums is : support-forums.novell.com They ofer this in both NNTP and web based formats.

-Mojo
0
 

Author Comment

by:stewartje
ID: 10888593
Mojo

thanks for the answer I apprecaite it very much.

As for the current problem, the hosts file has been modified to include mydomain.com but I am still getting the the following:

09:00:25 6 DMN:MSG 426 Send Failure: 450 host down. (mydomain.com)

09:00:41 0 MSG 427: Response 421 SMTP service not available, closing transmission channel

How do I fix this?

Jon
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