#Sonicwall netextender the server is not reachable how to#
How to configure Global VPN Client on SonicWall Next-Gen Firewall. So, you need to make sure that you have proper connectivity to the SonicWall to avoid the “ The peer is not responding to phase 1 ISAKMP requests” error. However, either your SonicWall WAN IP is not reachable or the UDP port 500 is blocked in between, you will get the same error. Global VPN Client uses UDP port 500 for the IKE Phase1 negotiation. You need to make sure you have proper connectivity to the SonicWall Firewall. Troubleshooting Connectivity Issue with the SonicWall Firewall. So, you need to make sure that you copied the correct PreShared Key. A PreShared key is used during the phase 1 parameter negotiation. In the IPSec tunnel, we have two different phases i.e. Troubleshooting ISAKMP – Phase 1 PreShared KeyĪs you already know, the Global VPN Client, establish an IPSec tunnel with the SonicWall Firewall. Now, you enable the Restrict the size of the first ISAKMP packet sent option, as shown in the below screenshot. You need to select the Global VPN Client Profile and click on Properties. This option is only available for Global VPN Client higher than 4.9.14 version. So, in this case, we need to enable Restrict the size of the first ISAKMP packet sent option under the Properties. Firewall in-between the path), it will simply not allow the fragmented packet. So, whenever the packet is crossing to other Layer 3 devices (i.e. 
Sometimes, when we initially try to connect to the Global VPN Client (GVC) on a SonicWall firewall, the initial ISAKMP packet is fragmented due to its less size. Navigate to VPN > Settings > VPN Policies and make sure you enabled WAN GroupVPN Policy as shown in the below screenshot. You need to make sure that the default WAN GroupVPN Policy must be enabled. By default, the WAN GroupVPN Policy is disabled. One of the most common issues with “ The peer is not responding to phase 1 ISAKMP requests“, is due to the default WAN GroupVPN Policy.
Now, let’s start with the possible solutions one by one. How to troubleshoot – The peer is not responding to phase 1 ISAKMP requests | SonicWall
Troubleshooting Connectivity Issue with the SonicWall Firewall.Troubleshooting ISAKMP – Phase 1 PreShared Key.Restrict the size of the first ISAKMP packet sent.Troubleshooting WAN GroupVPN Policy on SonicWall Firewall.How to troubleshoot – The peer is not responding to phase 1 ISAKMP requests | SonicWall.
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