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Error 421 service not available remote server has closed connection

Posted on 2014-03-07
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Last Modified: 2015-05-31
Hi Exchange Expert,

This morning I had an inbound mail issue. Outbound email was fine and working normal. There was intermittent inbound mail issue. No modification on exchange server configuration.

Error returned:

Error 421 service not available remote server has closed connection. Even when I tried to telnet from outside I got an error 421 4.3.2 service not available.

It started working after I adding 0.0.0.0 - 255.255.255.255 to receive connector -receive mail from remote servers list.

It was working fine until yesterday without specifying this IP range.

Any thoughts?

Thanks,

Deorali
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Question by:Deorali
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Expert Comment

by:Simon Butler (Sembee)
ID: 39912882
You must have had some kind of range in there for it to accept email.
The error you have posted is exactly what I would have expected if the range was wrong.
Furthermore it would have had that range in by default, unless it is an SBS server.

Simon.
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Author Comment

by:Deorali
ID: 39913023
This is what I had before and the mail was flowing without having to add the new range 0.0.0.0 - 255.255.255.255
receiveconnector.JPG
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Expert Comment

by:Simon Butler (Sembee)
ID: 39913182
Is this an SBS Server?

Simon
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Expert Comment

by:Mohammed Khawaja
ID: 39913185
There could be two possibilities:

1. Low disk space and for more see  http://support.microsoft.com/kb/284204
2. Backpressure feature and for more see http://technet.microsoft.com/en-us/library/bb201658.aspx
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Accepted Solution

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Deorali earned 0 total points
ID: 39913314
@Simon: Exchange 201 SP3.  Thanks.  After comparing range of IPs  with the original configuration,  found out that one of the co-workers removed an IP range 10.1.4.56 - 192.168.170 (pretty much this was there when I took over as Exchange admin) last night from the receive connector. Therefore, by me adding IP range 0.0.0.0- 255.255.255.255 might have resolved the issue.


@mnkhwaja: Not an issue with low disk space or backpressure and I mentioned above that after adding 0.0.0.0-255.255.255.255 to the receive connector it started working.

Thanks,

Chatur Tamang
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Author Closing Comment

by:Deorali
ID: 40804718
Please close this ticket.
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