Ok, so it seems we have one of the worlds most hardest problems to diagnose.
Our Sophos UTM (SG125 running 9.209-8) connecting to Microsoft Azure disconnects the VPN every about 55-57 minutes and takes between 2 minutes and 80 hours to reconnect (restarting the VPN on the Sophos makes it reconnect immediately, only to disconnect 55 minutes later).
We can confirm this every single hour by:
1. Starting the VPN
2. As soon as it starts, start a ping session over the VPN piping results to a text file.
3. Wait for it to stop pinging (I've been setting a timer for 55 minutes and then watching it intently and it stops every time within a few minutes)
4. I copy the ping results to Excel and count the number of successful ping rows and it always totals around 3400 which is about 57 minutes.
Anyone with any suggestions at all. I put a call into Sophos Premium Support today however they escalated it and we haven't heard back from them as yet.
Any help would be SUPER appreciated. This one is making us tear out hair and flesh! [:@]
Other people seem to have the problem on Cisco as well. however I'm not sure how their fix translates to our Sophos unit:https://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=0CCQQFjAB&url=http%3A%2F%2Fwww.dailylesson.co.uk%2Fazure-vpn-mysterious-57-minute-drop%2F&ei=l0x0VMjLPIOE8QXoh4HQCw&usg=AFQjCNFgwaqE1ty3p8I3QI157cWqzTBWIA&sig2=Ea3P7L7DjB0imjb6kGrurQ&bvm=bv.80185997,d.dGc
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