Tunnel closed for unknown reason

Hello,

I’m having trouble with 1 of my netbiter connections.
I’m getting this message
Tunnel closed
The tunnel was closed for an unknown reason.

I have tried updating firmware. And network bridge is set ON and saved.

This is the last message from the LOG file.
2021-07-20 11:51:29,798 INFO [qtp26871468-29] BasicTunnelClientApplicationService - Closing tunnel to i-0fd87fc69b1427f02.ra.netbiter.net
2021-07-20 11:51:29,798 INFO [qtp26871468-29] BasicTunnelClientApplicationService - Opening tunnel to i-0fd87fc69b1427f02.ra.netbiter.net
2021-07-20 11:51:29,798 INFO [qtp26871468-29] JettyWebSocketConnector - Connecting to “wss://i-0fd87fc69b1427f02.ra.netbiter.net:443/bifrost/tunnel/?tunnelId=1125926885&id=Aquarius&secret=747b224f2cdef24d639a5e80139ef75e”.
2021-07-20 11:51:29,834 INFO [qtp26871468-29] proxy - No proxy needed, connecting directly to https://i-0fd87fc69b1427f02.ra.netbiter.net:443
2021-07-20 11:52:29,179 INFO [t1125926885] LocalTunnelSegment - Channels and factories closed
2021-07-20 11:52:29,180 INFO [t1125926885] LocalTunnelListener - Tunnel disconnected, reason: UNKNOWN
2021-07-20 11:52:29,195 INFO [t1125926885] LocalTunnelListener - Tunnel disconnected, reason: TIME_TO_ESTABLISH_EXPIRED

kind regards Johan