The error message "TUNNELPROTOCOLDPDMGR_ERROR_NO_DPD_RESPONSE" indicates that the VPN client did not receive a response to its Dead Peer Detection (DPD) packets from the VPN gateway. Dead Peer Detection is a protocol used by VPN clients and gateways to monitor each other's presence and to detect if the connection has been lost.
When the VPN client does not receive a response to its DPD packets, it assumes that the connection to the VPN gateway has been lost and initiates a reconnection attempt. This may result in the VPN session being disconnected and reconnected.
There can be various reasons for the gateway to not respond to DPD packets:
- network congestion,
- firewall or security policy configurations, (not in your case I think)
- issues with the VPN gateway itself.
Check the VPN gateway logs to identify any issues that may be causing the failure to respond to DPD packets.
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