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The connection has been lost. Attempting to connect to your session. Repeats every 40 seconds

When logging into my server remotely, off-site, about ever 35-40 seconds I get "The connection has been lost.  Attempting to connect to your session."  Then it reconnects but then about 35-40 seconds it repeats the process.  Recently AT&T upgraded our DSL to U-verse and claiming there are no issues with their line.   We set the modem to pass-thru and we have our own Firewall that this thing passes through prior to the server.  Since we were using the same firewall previous to the upgrade with no problems, I am making an assumption this is not the cause.  

My first question is that I am assuming that setting the modem to pass-through their firewall would be automatically disabled, right?  Besides, I am thinking that if it was a firewall issue it would not allow me in for approx 40 seconds.  Anyone have an idea what may be causing this or what I can do to isolate what is.
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Venugopal NCommented:
Did you check with the Ping command and see if there is any drop on the Ping request.I don't think it was due to the Pass-through setting.It must be due to connection drop on every 40-50 Seconds.
MrGDAuthor Commented:
OK.  Obviously not an expert and thus the reason for having to ask so please bear with me.  The routing is the modem in pass-thru or DMZ mode what AT&T calls it, router/firewall, switch, and my server.  
Based on the documentation that I have, there are three Static IP addresses.   One for the Modem, Router/Firewall, and the server which all appear to be public IP addresses.
If I ping the Modem - timed out.  If I ping the router - timed out at first but then fine for as long as it is being pinged.  Configured continuous ping. Same thing happens to the server.  We do not seem to be experiencing any issues internally.  To me this might be indicating there is an issue with the modem.  Is there anyway for me to isolate the modem and test it since I can not ping it directly?  Could I configure a laptop with one of the static IP addresses and ping the laptop?  If I encounter the same issue, I could then assume there is an issue with the modem.  Correct?
MrGDAuthor Commented:
OK.  Internet provider verified there was an issue with the line.  Just an update they stated that there was no way for me to directly ping their modem thus the reason I could only ping my hardware.
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