Hello everyone,

We’re having a pretty interesting problem here …

To give you the quick summary, we have AT&T U-Verse “Business Fiber” (which is 
a fancy way of saying it’s actual fiber, but the budget kind …) and have very 
serious issues establishing any TLS or SSL encrypted connections through IPSec 
tunnels.

If we plug a SonicWALL device in, same tunnel settings, we have no issues at 
all.  But our pfSense device (it is a SG-2440) struggles very hard and we 
cannot do simple encrypted services over this tunnel — including downloading 
email, synchronizing AD domain servers, or even rsync over SSH.

It’s been very troubling.  When plugging in the SonicWALL, all of these 
services work completely flawlessly.  The second we use the pfSense, none of 
the encrypted protocols through the tunnel work.

I’ve been thinking about MSS and MTU, but I really don’t know where to begin.  
The SonicWALL seems to be able to figure these things out on its own (if that’s 
even the issue).  But I’m at a total loss.

Any suggestions?

~ Laz Peterson
Paravis, LLC
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