Listener socket is closed
Any idea? 

> FLECK: Error while listening for new clients One or more errors occurred.
> FLECK: Listener socket restarting
> FLECK: Server started at ws://0.0.0.0:8181 (actual port 8181)
> FLECK: Listener socket restarted
> FLECK: Error while listening for new clients One or more errors occurred.
> FLECK: Listener socket restarting
> FLECK: Server started at ws://0.0.0.0:8181 (actual port 8181)
> FLECK: Listener socket restarted
> Closing/Disposing WebSocketConnection. Not able to perform handshake within 20s.
> Connecting: 87.120.216.243
> 5957da8d-5087-4262-b0c8-bca0d2cb8fdb: connected with ip 87.120.216.243
> Warning: Outdated client connected. Make sure to update the clients
> 5957da8d-5087-4262-b0c8-bca0d2cb8fdb: handshake - minexmr.com, 47Zg611h...
> 5957da8d-5087-4262-b0c8-bca0d2cb8fdb: reusing pool connection
> 5957da8d-5087-4262-b0c8-bca0d2cb8fdb: got job from pool
> FLECK: Error while listening for new clients One or more errors occurred.
> FLECK: Listener socket restarting
> FLECK: Server started at ws://0.0.0.0:8181 (actual port 8181)
> FLECK: Listener socket restarted
> FLECK: Error while listening for new clients One or more errors occurred.
> FLECK: Listener socket restarting
> FLECK: Server started at ws://0.0.0.0:8181 (actual port 8181)
> FLECK: Listener socket restarted
> f69e6ba9-cfa5-40fb-9d3b-2fd19a0773a6: reports solved hash
> FLECK: Error while listening for new clients One or more errors occurred.
> FLECK: Listener socket restarting
> FLECK: Server started at ws://0.0.0.0:8181 (actual port 8181)
> FLECK: Listener socket restarted
> f69e6ba9-cfa5-40fb-9d3b-2fd19a0773a6: solved job
> FLECK: Error while listening for new clients One or more errors occurred.
> FLECK: Listener socket restarting
> FLECK: Server started at ws://0.0.0.0:8181 (actual port 8181)
> FLECK: Listener socket restarted
> FLECK: Error while listening for new clients One or more errors occurred.
> FLECK: Listener socket restarting
> FLECK: Server started at ws://0.0.0.0:8181 (actual port 8181)
> FLECK: Listener socket restarted
> FLECK: Error while listening for new clients One or more errors occurred.
> FLECK: Listener socket restarting
> FLECK: Server started at ws://0.0.0.0:8181 (actual port 8181)
> FLECK: Listener socket restarted
> 685afb65-1e10-43e6-a9bf-69dc54cf1e89: reports solved hash
> 685afb65-1e10-43e6-a9bf-69dc54cf1e89: got hash-checked
> FLECK: Error while listening for new clients One or more errors occurred.
> 