In my case the size was already at 1400 so I changed it to the maximum (1500) and this has fixed the VPN connectivity. In the MTU size field, enter a value between 64 to 1500.Connect to your router via a browser (you’ll have been provided a username and password by your ISP provider).The following are the steps I took to configure my router (with Foxtel) If one of these network devices have an MTU size smaller than the packet size being transmitted, the packets will be fragmented which will cause our error above. When connecting to a peer via the internet, there are many devices along the way that the data packets go through. OR: Configure your wifi (broadband) to increase the MTU size (Maximum Transmission Unit).I’m assuming it’s not the ISP router at their homebut if it is, this is an ISP issue. If you are indeed responsible for their home network, you might end up having to dig around in their router. In my case, the user didn’t have admin rights so I had to do step 2 instead. The home home network is somewhat reasonablebut if they can get to the webpage but not the SSLVPN connection, that’s indicative. If this setting is not available, you will need to update your VPN client.General tab > Enable “Restrict the size of the first ISAKMP packet sent” (at the bottom).On the SonicWall GVC – File > Properties.Configure the VPN Client to restrict the packet size on the first ISAKMP request:.It fails when I am connected to the internet via our Home broadband (Foxtel) but it connects successfully when I am connected to mobile data hotspot (Vodafone). I got this error when trying to connect using my VPN client tool (Dell SonicWall Global VPN Client).
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