Linux 菜鸟求帮忙看看这个 fail2ban 日志..装好基本保持了默认配置..这些日志内容是什么意思?我需要做什么调整吗?

Jan 11 18:40:01 default CRON[3483]: pam_unix(cron:session): session opened for user smmsp by (uid=0)
Jan 11 18:40:01 default CRON[3482]: pam_unix(cron:session): session opened for user root by (uid=0)
Jan 11 18:40:01 default CRON[3482]: pam_unix(cron:session): session closed for user root
Jan 11 18:40:05 default CRON[3483]: pam_unix(cron:session): session closed for user smmsp
Jan 11 19:00:01 default CRON[3504]: pam_unix(cron:session): session opened for user smmsp by (uid=0)
Jan 11 19:00:05 default CRON[3504]: pam_unix(cron:session): session closed for user smmsp
Jan 11 19:16:58 default sshd[3525]: Bad protocol version identification 'GET / HTTP/1.0' from 198.35.46.4
Jan 11 19:16:58 default sshd[3526]: Did not receive identification string from 198.35.46.4
Jan 11 19:20:01 default CRON[3529]: pam_unix(cron:session): session opened for user smmsp by (uid=0)
Jan 11 19:20:06 default CRON[3529]: pam_unix(cron:session): session closed for user smmsp
Jan 11 19:40:01 default CRON[3548]: pam_unix(cron:session): session opened for user smmsp by (uid=0)
Jan 11 19:40:01 default CRON[3547]: pam_unix(cron:session): session opened for user root by (uid=0)
Jan 11 19:40:01 default CRON[3547]: pam_unix(cron:session): session closed for user root
Jan 11 19:40:05 default CRON[3548]: pam_unix(cron:session): session closed for user smmsp
Jan 11 20:00:01 default CRON[3569]: pam_unix(cron:session): session opened for user smmsp by (uid=0)
Jan 11 20:00:05 default CRON[3569]: pam_unix(cron:session): session closed for user smmsp
Jan 11 20:17:19 default sshd[3589]: Bad protocol version identification 'GET / HTTP/1.0' from 198.35.46.4
Jan 11 20:17:19 default sshd[3590]: Did not receive identification string from 198.35.46.4
Jan 11 20:20:01 default CRON[3593]: pam_unix(cron:session): session opened for user smmsp by (uid=0)
Jan 11 20:20:05 default CRON[3593]: pam_unix(cron:session): session closed for user smmsp
Jan 11 20:40:01 default CRON[3613]: pam_unix(cron:session): session opened for user smmsp by (uid=0)
Jan 11 20:40:01 default CRON[3612]: pam_unix(cron:session): session opened for user root by (uid=0)
Jan 11 20:40:01 default CRON[3612]: pam_unix(cron:session): session closed for user root
Jan 11 20:40:05 default CRON[3613]: pam_unix(cron:session): session closed for user smmsp
Jan 11 21:00:01 default CRON[3633]: pam_unix(cron:session): session opened for user smmsp by (uid=0)
Jan 11 21:00:06 default CRON[3633]: pam_unix(cron:session): session closed for user smmsp
Jan 11 21:16:57 default sshd[3654]: Bad protocol version identification 'GET / HTTP/1.0' from 198.35.46.4
Jan 11 21:16:57 default sshd[3655]: Did not receive identification string from 198.35.46.4
Jan 11 21:20:01 default CRON[3658]: pam_unix(cron:session): session opened for user smmsp by (uid=0)
Jan 11 21:20:05 default CRON[3658]: pam_unix(cron:session): session closed for user smmsp
Jan 11 21:31:11 default sshd[3676]: Accepted publickey for root from 221.218.179.63 port 52227 ssh2
Jan 11 21:31:11 default sshd[3676]: pam_unix(sshd:session): session opened for user root by (uid=0)