"Last attempted proof" stopped randomly, So I have to restart the GUI when I found it's stopped, see debug.log below

[michaelyu16]

2021-09-03T23:47:24.417 full_node full_node_server : WARNING Banning 220.141.164.252 for 10 seconds
2021-09-03T23:47:24.419 full_node full_node_server : WARNING Invalid handshake with peer. Maybe the peer is running old software.
2021-09-04T00:45:35.259 full_node full_node_server : WARNING Banning 49.159.122.194 for 10 seconds
2021-09-04T00:45:35.261 full_node full_node_server : WARNING Invalid handshake with peer. Maybe the peer is running old software.
2021-09-04T01:26:07.697 full_node full_node_server : WARNING Banning 220.141.164.252 for 10 seconds
2021-09-04T01:26:07.699 full_node full_node_server : WARNING Invalid handshake with peer. Maybe the peer is running old software.
2021-09-04T01:57:42.303 full_node full_node_server : WARNING Cannot write to closing transport 114.218.20.35
2021-09-04T02:04:56.964 full_node full_node_server : WARNING Banning 220.141.164.252 for 10 seconds
2021-09-04T02:04:56.966 full_node full_node_server : WARNING Invalid handshake with peer. Maybe the peer is running old software.
2021-09-04T02:36:15.311 full_node full_node_server : WARNING Banning 220.141.164.252 for 10 seconds
2021-09-04T02:36:15.313 full_node full_node_server : WARNING Invalid handshake with peer. Maybe the peer is running old software.
2021-09-04T03:28:06.977 full_node full_node_server : WARNING Banning 220.141.164.252 for 10 seconds
2021-09-04T03:28:06.979 full_node full_node_server : WARNING Invalid handshake with peer. Maybe the peer is running old software.

[loppefaaret]

these message stretches over nearly 4 hours - it is possibly other misconfigured clients from other forks, or perhaps even older chia clients that your node is dropping cause of incompatiblity - either look for other WARNING or ERROR or try and setting the log to INFO - either in the config.yaml or from CLI with chia configure --log-level INFO and restart chia
the above WARNING should not have any noticable effect on getting challenges to the harvester
there is however currently some effects where are trying to fix on mainnet, see #8307

[BrandtH22]

@michaelyu16 , since this ticket was opened a number of years ago without further comments it seems this issue has been resolved.
We will be closing this ticket but if we have closed this ticket in error do not hesitate to reach out to us again with any followup questions or comments.

The best place to reach our support team is on Discord (https://discord.gg/chia) or by reopening this ticket.