Firewalls sometimes lose VPN connection info

[majst01]

Because the timeout to fetch the vpn state from headscale is set to low:

This log in the headscale indicates that

2024-01-31T10:02:09Z INF Notifying peers handler=PollNetMap machine=b6cdfc00-e229-11e9-8000-3cecef2213cc noise=true
2024-01-31T10:02:09Z ERR Could not write the map response error="http2: stream closed" channel=update handler=PollNetMapStream machine=85d6fe00-e3c6-11e9-8000-3cecef22ac30 noise=true
2024-01-31T10:02:11Z INF Client sent endpoint update and is ok with a response without peer list handler=PollNetMap machine=c94db000-0e01-11eb-8000-3cecef477000 noise=true
2024-01-31T10:02:11Z ERR go/src/headscale/hscontrol/protocol_common_poll.go:180 > Failed to write response error="client disconnected"
2024-01-31T10:02:12Z INF Client sent endpoint update and is ok with a response without peer list handler=PollNetMap machine=fe548800-e229-11e9-8000-3cecef22ae92 noise=true
2024-01-31T10:02:12Z ERR go/src/headscale/hscontrol/protocol_common_poll.go:180 > Failed to write response error="http2: stream closed"
2024-01-31T10:02:12Z INF Client sent endpoint update and is ok with a response without peer list handler=PollNetMap machine=85d6fe00-e3c6-11e9-8000-3cecef22ac30 noise=true
2024-01-31T10:02:12Z ERR go/src/headscale/hscontrol/protocol_common_poll.go:180 > Failed to write response error="client disconnected"
2024-01-31T10:02:12Z INF Client sent endpoint update and is ok with a response without peer list handler=PollNetMap machine=1e426800-e1a6-11e9-8000-3cecef22ae4e noise=true
2024-01-31T10:02:12Z ERR go/src/headscale/hscontrol/protocol_common_poll.go:180 > Failed to write response error="client disconnected"
2024-01-31T10:02:13Z INF Client sent endpoint update and is ok with a response without peer list handler=PollNetMap machine=53c96000-e16a-11e9-8000-3cecef22ae50 noise=true
2024-01-31T10:02:13Z ERR go/src/headscale/hscontrol/protocol_common_poll.go:180 > Failed to write response error="client disconnected"
2024-01-31T10:02:15Z INF Client sent endpoint update and is ok with a response without peer list handler=PollNetMap machine=a36b8e00-e3ed-11e9-8000-3cecef22af78 noise=true
2024-01-31T10:02:15Z ERR go/src/headscale/hscontrol/protocol_common_poll.go:180 > Failed to write response error="client disconnected"
2024-01-31T10:02:17Z INF Client sent endpoint update and is ok with a response without peer list handler=PollNetMap machine=00000000-0000-0000-0000-ac1f6bd3911c noise=true
2024-01-31T10:02:17Z ERR go/src/headscale/hscontrol/protocol_common_poll.go:180 > Failed to write response error="client disconnected"
2024-01-31T10:02:17Z INF Client sent endpoint update and is ok with a response without peer list handler=PollNetMap machine=c2de4400-be9d-11e9-8000-3cecef22ae58 noise=true
2024-01-31T10:02:17Z ERR go/src/headscale/hscontrol/protocol_common_poll.go:180 > Failed to write response error="client disconnected"
2024-01-31T10:02:19Z INF Client sent endpoint update and is ok with a response without peer list handler=PollNetMap machine=4f5b5e00-69ad-11ed-8000-3cecefa838ba noise=true
2024-01-31T10:02:19Z ERR go/src/headscale/hscontrol/protocol_common_poll.go:180 > Failed to write response error="client disconnected"
2024-01-31T10:02:20Z INF Client sent endpoint update and is ok with a response without peer list handler=PollNetMap machine=011eae00-e2fa-11e9-8000-3cecef22b01a noise=true