failed to connect to socket

[linuxxx]

2021-08-25 17:55:39.365 953-953/? E/adbd: failed to connect to socket 'tcp:4480': Connection refused
2021-08-25 17:55:50.267 953-953/? E/adbd: failed to connect to socket 'tcp:4480': Connection refused
2021-08-25 17:56:01.361 953-953/? E/adbd: failed to connect to socket 'tcp:4480': Connection refused
2021-08-25 17:56:12.371 953-953/? E/adbd: failed to connect to socket 'tcp:4480': Connection refused