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No connection could be made because the target machine actively refused it - Exchange 2010, sonicwall, Barracuda 300

Posted on 2012-03-13
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Last Modified: 2012-03-18
Suddenly external email to our company stopped reaching our building, while internal email continues to function.

We have a Sonicwall which directs the email to a Barracuda Spam filter, which sends it to our Exchange 2010 Server. There is no mail reaching the Barracuda. The NAT policy in the Sonicwall to send the mail to the Barracuda appears to be intact and nothing there has been changed. I have restarted both the Sonicwall and the Barracuda.

I went to mxtoolbox.com  and did an MX lookup for one of our domains. It looks correct. Then I did a DNS lookup which looks okay too. When I did an SMTP test, it says "No connection could be made because the target machine actively refused it (my public ip address):25"

I am not sure what to do at this point, any help is appreciated - thank you.
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Question by:ksoszka
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Expert Comment

by:crash2000
ID: 37714258
Does your SonicWall require a annual subscription? Just a thought
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Author Comment

by:ksoszka
ID: 37714285
Yes, actually it looks like our Software and Firmware updates and Hardware warranty expired on Jan 9, 2012. The purchase of a new appliance has been tied up in corporate and delayed, this one is outdated (Pro 3060). Would the expired Software and Firmware updates cause this? Should there be a warning or notification somewhere? Thanks
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Author Comment

by:ksoszka
ID: 37714311
Also - if this helps, Internet and other services (Terminal Services) are working okay..
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Expert Comment

by:crash2000
ID: 37714426
I'm not sure about SonicWall, but this does happen on other routers.
You may have had 1 month to update before it switches off.

Mark
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LVL 16

Expert Comment

by:Syed_M_Usman
ID: 37715902
Dear,

i would like to know how many WAN connections you have? +
if you telnet your publicip on port 25 what is the responce from outside? +
what logs tells about outoing email, are emails set in quee if yes ... you will see an ip assonicated with the email ... can you confirm this is your public ip for emails?
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Accepted Solution

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ksoszka earned 0 total points
ID: 37717573
It turns out that it was the Barracuda Spam Appliance, the MTA Service had stopped and my restart did not correct that because apparently when I restart my Barracuda it does not actually restart, due to a firmware bug. Their tech started the service and the mail started flowing. Worked for an hour, broken again - at any rate the issue is with the Barracuda Spam filter. Thanks to all who replied for trying!
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Author Closing Comment

by:ksoszka
ID: 37734448
The issue is with the Barracuda Spam filter, being fixed by their techs.
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