我有一台 RHEL 6.8 x86_64 服务器，其 SSH 服务器长期存在问题。它安装了 openssh-5.3p1-118.1.el6_8.x86_64。每次尝试连接 SSH/SFTP 时，服务器都会返回错误：
ssh_exchange_identification: read: Connection reset by peer
这种情况并非每次都会发生，因此很难调试。当这种情况发生时，即使有更详细的日志记录，SSH 日志中也不会显示任何有关所发生情况的信息。我注意到的是，我必须每隔几周重新启动 sshd，否则它会完全停止工作。
您能就如何诊断和修复此问题提供任何建议吗？
ssh -vvv更新（2016 年 8 月 27 日）：以下是连接失败的结果：
timothys-MacBook-Pro:~ tbutler$ ssh -vvv tbutler@myserver
OpenSSH_6.9p1, LibreSSL 2.1.8
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 21: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to myserver [xx.xx.xx.xx] port 22.
debug1: Connection established.
debug1: identity file /Users/tbutler/.ssh/id_rsa type 1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/tbutler/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/tbutler/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/tbutler/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/tbutler/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/tbutler/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/tbutler/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/tbutler/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.9
ssh_exchange_identification: read: Connection reset by peer
我尝试再次登录，结果还是一样。最后，在第三次尝试时，我终于能够连接，结果调试信息看起来差不多，但随后继续：
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.3
debug1: match: OpenSSH_5.3 pat OpenSSH_5* compat 0x0c000000