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01.16.2008 at 02:54PM PST, ID: 23088752
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Client host rejected: too many connections( 2 )

Tags: Diagnostic-Code: SMTP; 554 <spam2.state.ar.us[xxx.xxx.xxx.xxx]>: Client host rejected: too many connections( 2 )
I'm using MDaemon v9.0.0 for an email server and a Barracuda spam firewall 300. People are complaining about emails being kicked back to them from outside our system. We are a school district and our state Department of Information services tells us that they have a lot of email kicked back to them. The error messages are below. Can someone help me diagnose this problem as I am a complete noob on troubleshooting email and spam firewall issues.

Reporting-MTA: dns; spam2.state.ar.us
Arrival-Date: Thu, 10 Jan 2008 11:17:42 -0600

Final-Recipient: RFC822; someuseremail@bsd.k12.ar.us
Action: failed
Status: 5.5.0
Diagnostic-Code: SMTP; 554 <spam2.state.ar.us[165.xx.xx.xx]>: Client host rejected: too many connections( 2 )
Last-Attempt-Date: Thu, 10 Jan 2008 11:19:00 -0600

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Question Stats
Zone: Networking
Question Asked By: a_fishy_fella
Solution Provided By: FilipZahradnik
Participating Experts: 1
Solution Grade: A
Views: 129
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01.16.2008 at 03:09PM PST, ID: 20677209

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01.16.2008 at 03:09PM PST, ID: 20677209
This error means that the number of current incoming SMTP sessions exceeds a limit and it appears your limit is 2.

Depending on your setup, SMTP clients may be talking directly to your Mdaemon, or to your Barracuda (it performs some sort of SMTP filtering).

To check SMTP limit on your Mdaemon, go to the server GUI. In the top menu go to Setup->Primary Domain->Sessions tab. Second field from top is "Maximum concurrent SMTP inbound sessions". Is it 2? Try increasing it. The exact number depends on your servers config, but 50 should be a good start.

I am not familiar with Barracuda firewalls, but have a look around the GUI to see if there is a limit.
Accepted Solution
 
 
01.28.2008 at 08:30AM PST, ID: 20760513
This was a good first step and got me on my way to a solution. In addition to this suggestion I had to go into my Barracuda Spam Firewall under Advanced>Rate Control>Rate Control Exclude IP/Range and add ip addresss to our state relay servers and filters. Thanks FilipZahradnik
 
 
01.28.2008 at 03:41PM PST, ID: 20764110
Glad to help...
 
 
 
20080236-EE-VQP-29 / EE_QW_2_20070628