当时产品发现页面无法正常发送短信，点击就报错“out of memory ”，一看以为内存溢出，连上服务器 发现内存还有很多。
同时又发现xhell无法连接服务器。就解决 这个问题
[root@apps ~]# cat /var/log/secure
Jul 19 21:16:22 apps sshd[17349]: pam_unix(sshd:session): session closed for user jgw Jul 19 21:17:53 apps sshd[21807]: Accepted password for jgw from 61.164.59.252 port 6452 ssh2 Jul 19 21:17:53 apps sshd[21807]: pam_unix(sshd:session): session opened for user jgw by (uid=0) Jul 19 21:18:06 apps sshd[21836]: Accepted password for jgw from 61.164.59.252 port 6453 ssh2 Jul 19 21:18:06 apps sshd[21836]: pam_unix(sshd:session): session opened for user jgw by (uid=0) Jul 19 21:18:18 apps su: pam_unix(su-l:session): session opened for user root by jgw(uid=1000)
原文：https://www.cnblogs.com/sheng-247/p/11215770.html