If traffic cannot reach the MX on these ports, the connection will time out and fail. Solution: Ensure UDP ports 500 (IKE) and 4500 (IPsec NAT-T) are being forwarded to the MX and not blocked. More information about setting the shared secret can be found in the links at the top of the page. It must match between the MX and the client. Solution: Ensure that the shared secret is configured correctly on the client machine. Incorrect secret key (preshared key in Windows).This issue may also result in no event log messages if the client's traffic doesn't successfully reach the MX's WAN interface. Jul 2 13:53:20 VPN msg: invalid DH group 20. Jul 2 13:53:20 VPN msg: invalid DH group 19. For configuring client VPN on OS devices, please refer to our Client VPN OS Configuration documentation. Use this document to identify and resolve client VPN issues faster. This article also outlines troubleshooting methods for client VPNconnectivity issues, primarily for Windows-based clients, including a list of common errors as well as some common issues and solutions for accessing resources over client VPN. This document is a guide for administrators and users while troubleshooting client VPN issues. Troubleshooting Client VPN with Packet Captures.Resolving NetBIOS names over client VPN.Accessing resources over the tunnel via IP vs.Can Connect to VPN but Cannot Access Resources.The MX is Not Receiving the Client VPN Connection Attempt.VPN adaptor configurations/Windows update.Upstream NAT/firewall issue on the MX side.
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