Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

Valid emails being deferred through Barracuda 100 Spam/Virus Firewall

Posted on 2011-03-01
3
Medium Priority
?
2,285 Views
Last Modified: 2012-05-11
We have a small business network with a Barracuda Spam Virus Firewall and over the past few months I have seen an increase in the number of deferred messages for valid email addresses.  It's not all emails for certain domains, in fact for one domain I have seen some come right through and others never make it.

Talked to Barracuda support, upgraded to the latest firmware, increased timeout, etc and they say it must be upstream.  I did some further testing by taking the firewall out of the mix while watching some specific deferred messages, and those messages dropped right through to Exchange, so I'm not convinced it's an upstream issue?

My configuration is Qwest DSL with fixed IP and have port 25 forwarded to the Barracuda on the DSL modem. Don't have the firewall enabled on the modem, just NAT.

Read some other articles, but no solutions.  Any ideas what to check next?
0
Comment
Question by:KZim
  • 2
3 Comments
 
LVL 12

Accepted Solution

by:
Sommerblink earned 2000 total points
ID: 35014074
Well, technically it is an upstream issue.. its just not that far away upstream.

Things to look for are the number of sessions that your DSL/NAT/PAT device can handle. Whether your DSL/NAT/PAT device can handle concurrency to the same inbound port.

I would suggest purchasing a proper firewall verses relying on something free... especially since you've already taken several steps in the right direction towards spam elimination, the Barracuda... sorry, I am very partial towards that product line :)

Even something like the Cisco RV series would probly be a large step forward, without a large capital investment. (http://www.cisco.com/cisco/web/solutions/small_business/products/routers_switches/small_business_routers/index.html)
0
 

Author Comment

by:KZim
ID: 35016104
Just to make sure I understand your suggestion, it's that the DSL model (an ActionTec M1000) potentially isn't robust enough to handle the incoming traffic appropriately.  So look to replace it with a more robust router (such as the Cisco), right?
0
 

Author Comment

by:KZim
ID: 35036414
In looking at the Cisco line, these aren't ADSL routers, so my Qwest DSL modem would stay in place, right?  How would that hellp the throughput.  Or, do I need to look at another product to replace the actiontec competely?
0

Featured Post

New Tabletop Appliances Blow Competitors Away!

WatchGuard’s new T15, T35 and T55 tabletop UTMs provide the highest-performing security inspection in their class, allowing users at small offices, home offices and distributed enterprises to experience blazing-fast Internet speeds without sacrificing enterprise-grade security.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This month, Experts Exchange’s free Course of the Month is focused on CompTIA IT Fundamentals.
Tech spooks aren't just for those who are tech savvy, it also happens to those of us running a business. Check out the top tech spooks for business owners.
Established in 1997, Technology Architects has become one of the most reputable technology solutions companies in the country. TA have been providing businesses with cost effective state-of-the-art solutions and unparalleled service that is designed…
Monitoring a network: why having a policy is the best policy? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the enormous benefits of having a policy-based approach when monitoring medium and large networks. Software utilized in this v…

886 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question