我得到了以下脚本：
COUNTER=0
while [ $COUNTER -lt 1000 ]; do
echo The counter is $COUNTER
let COUNTER=COUNTER+1
echo -e date\\nexit | sshpass -p 'XXXXXX' ssh -vvv -o ConnectTimeout=30000 -o LogLevel=DEBUG3 -t -t -l root xx.xx.xx.xx
基本上，它在远程服务器上执行1000次“date”命令。偶尔（这1000次运行的1-5次），ssh在登录后冻结，没有执行任何操作。我没有在控制台上写的任何东西，我唯一的选择是ctrl + C来杀死会话或ctrl + Z来杀死脚本。以下是成功会话和冻结会话的错误日志：
成功：
OpenSSH_5.1p1, OpenSSL 0.9.8j-fips 07 Jan 2009
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug3: cipher ok: aes256-ctr [aes256-ctr,aes128-ctr,aes128-ctr,aes192-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc]
debug3: cipher ok: aes128-ctr [aes256-ctr,aes128-ctr,aes128-ctr,aes192-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc]
debug3: cipher ok: aes128-ctr [aes256-ctr,aes128-ctr,aes128-ctr,aes192-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc]
debug3: cipher ok: aes192-ctr [aes256-ctr,aes128-ctr,aes128-ctr,aes192-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc]
debug3: cipher ok: arcfour256 [aes256-ctr,aes128-ctr,aes128-ctr,aes192-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc]
debug3: cipher ok: arcfour128 [aes256-ctr,aes128-ctr,aes128-ctr,aes192-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc]
debug3: cipher ok: aes128-cbc [aes256-ctr,aes128-ctr,aes128-ctr,aes192-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc]
debug3: cipher ok: 3des-cbc [aes256-ctr,aes128-ctr,aes128-ctr,aes192-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc]
debug3: ciphers ok: [aes256-ctr,aes128-ctr,aes128-ctr,aes192-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc]
debug2: mac_setup: found hmac-sha1
debug3: mac ok: hmac-sha1 [hmac-sha1]
debug3: macs ok: [hmac-sha1]
debug1: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to 10.23.66.193 [10.23.66.193] port 22.
debug2: fd 3 setting O_NONBLOCK
debug1: fd 3 clearing O_NONBLOCK
debug1: Connection established.
debug3: timeout: 125163520 ms remain after connect
debug1: permanently_set_uid: 0/0
debug3: Not a RSA1 key file /root/.ssh/id_rsa.
debug2: key_type_from_name: unknown key type '-----BEGIN'
debug3: key_read: missing keytype
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug2: key_type_from_name: unknown key type '-----END'
debug3: key_read: missing keytype
debug1: identity file /root/.ssh/id_rsa type 1
debug1: identity file /root/.ssh/id_dsa type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.3
debug1: match: OpenSSH_5.3 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.1
debug2: fd 3 setting O_NONBLOCK
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: aes256-ctr,aes128-ctr,aes128-ctr,aes192-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc
debug2: kex_parse_kexinit: aes256-ctr,aes128-ctr,aes128-ctr,aes192-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc
debug2: kex_parse_kexinit: hmac-sha1
debug2: kex_parse_kexinit: hmac-sha1
debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib
debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib@openssh.com
debug2: kex_parse_kexinit: none,zlib@openssh.com
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: mac_setup: found hmac-sha1
debug1: kex: server->client aes256-ctr hmac-sha1 none
debug2: mac_setup: found hmac-sha1
debug1: kex: client->server aes256-ctr hmac-sha1 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<4096<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug2: dh_gen_key: priv key bits set: 253/512
debug2: bits set: 2094/4096
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug3: check_host_in_hostfile: filename /dev/null
debug3: check_host_in_hostfile: filename /etc/ssh/ssh_known_hosts
Warning: Permanently added '10.23.66.193' (RSA) to the list of known hosts.
debug2: bits set: 2016/4096
debug1: ssh_rsa_verify: signature correct
debug2: kex_derive_keys
debug2: set_newkeys: mode 1
debug2: cipher_init: set keylen (16 -> 32)
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug2: set_newkeys: mode 0
debug2: cipher_init: set keylen (16 -> 32)
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug2: key: /root/.ssh/id_rsa (0x7f95a0842a00)
debug2: key: /root/.ssh/id_dsa ((nil))
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug3: start over, passed a different list publickey,gssapi-keyex,gssapi-with-mic,password
debug3: preferred publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Offering public key: /root/.ssh/id_rsa
debug3: send_pubkey_test
debug2: we sent a publickey packet, wait for reply
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug1: Trying private key: /root/.ssh/id_dsa
debug3: no such identity: /root/.ssh/id_dsa
debug2: we did not send a packet, disable method
debug3: authmethod_lookup password
debug3: remaining preferred: ,password
debug3: authmethod_is_enabled password
debug1: Next authentication method: password
debug3: packet_send2: adding 64 (len 56 padlen 8 extra_pad 64)
debug2: we sent a password packet, wait for reply
debug1: Authentication succeeded (password).
debug2: fd 6 setting O_NONBLOCK
debug2: fd 7 setting O_NONBLOCK
debug2: fd 8 setting O_NONBLOCK
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug1: Requesting no-more-sessions@openssh.com
debug1: Entering interactive session.
tcgetattr: Invalid argument
debug2: callback start
debug2: client_session2_setup: id 0
debug2: channel 0: request pty-req confirm 1
debug1: tty_make_modes: no fd or tio
debug1: Sending environment.
debug3: Ignored env LESSKEY
debug3: Ignored env MANPATH
debug3: Ignored env INFODIR
debug3: Ignored env NNTPSERVER
debug3: Ignored env HOSTNAME
debug3: Ignored env XKEYSYMDB
debug3: Ignored env SHELL
debug3: Ignored env TERM
debug3: Ignored env HOST
debug3: Ignored env XDG_SESSION_COOKIE
debug3: Ignored env HISTSIZE
debug3: Ignored env PROFILEREAD
debug3: Ignored env MORE
debug3: Ignored env USER
debug3: Ignored env LS_COLORS
debug3: Ignored env XNLSPATH
debug3: Ignored env ENV
debug3: Ignored env HOSTTYPE
debug3: Ignored env TMOUT
debug3: Ignored env FROM_HEADER
debug3: Ignored env PAGER
debug3: Ignored env CSHEDIT
debug3: Ignored env XDG_CONFIG_DIRS
debug3: Ignored env MINICOM
debug3: Ignored env PATH
debug3: Ignored env MAIL
debug3: Ignored env CPU
debug3: Ignored env PWD
debug3: Ignored env INPUTRC
debug1: Sending env LANG = POSIX
debug2: channel 0: request env confirm 0
debug3: Ignored env PYTHONSTARTUP
debug3: Ignored env HOME
debug3: Ignored env SHLVL
debug3: Ignored env OSTYPE
debug3: Ignored env LESS_ADVANCED_PREPROCESSOR
debug3: Ignored env LS_OPTIONS
debug3: Ignored env LOGNAME
debug3: Ignored env MACHTYPE
debug3: Ignored env LESS
debug1: Sending env LC_CTYPE = en_US.UTF-8
debug2: channel 0: request env confirm 0
debug3: Ignored env XDG_DATA_DIRS
debug3: Ignored env LESSOPEN
debug3: Ignored env INFOPATH
debug3: Ignored env LESSCLOSE
debug3: Ignored env G_BROKEN_FILENAMES
debug3: Ignored env COLORTERM
debug3: Ignored env mc
debug3: Ignored env _
debug2: channel 0: request shell confirm 1
debug2: fd 3 setting TCP_NODELAY
debug2: callback done
debug2: channel 0: open confirm rwindow 0 rmax 32768
debug2: channel_input_confirm: type 99 id 0
debug2: PTY allocation request accepted on channel 0
debug2: channel 0: rcvd adjust 2097152
debug2: channel_input_confirm: type 99 id 0
debug2: shell request accepted on channel 0
debug2: channel 0: read<=0 rfd 6 len 0
debug2: channel 0: read failed
debug2: channel 0: close_read
debug2: channel 0: input open -> drain
debug2: channel 0: ibuf empty
debug2: channel 0: send eof
debug2: channel 0: input drain -> closed
debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
debug2: channel 0: rcvd eof
debug2: channel 0: output open -> drain
debug2: channel 0: rcvd close
debug3: channel 0: will not send data after close
debug3: channel 0: will not send data after close
debug2: channel 0: obuf empty
debug2: channel 0: close_write
debug2: channel 0: output drain -> closed
debug2: channel 0: almost dead
debug2: channel 0: gc: notify user
debug2: channel 0: gc: user detached
debug2: channel 0: send close
debug2: channel 0: is dead
debug2: channel 0: garbage collecting
debug1: channel 0: free: client-session, nchannels 1
debug3: channel 0: status: The following connections are open:
#0 client-session (t4 r0 i3/0 o3/0 fd -1/-1 cfd -1)
debug3: channel 0: close_fds r -1 w -1 e 8 c -1
debug1: fd 0 clearing O_NONBLOCK
debug1: fd 1 clearing O_NONBLOCK
debug1: fd 2 clearing O_NONBLOCK
Connection to 10.23.66.193 closed.
Transferred: sent 1952, received 3064 bytes, in 0.2 seconds
Bytes per second: sent 8868.1, received 13919.9
debug1: Exit status 0
冷冻：
OpenSSH_5.1p1, OpenSSL 0.9.8j-fips 07 Jan 2009
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug3: cipher ok: aes256-ctr [aes256-ctr,aes128-ctr,aes128-ctr,aes192-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc]
debug3: cipher ok: aes128-ctr [aes256-ctr,aes128-ctr,aes128-ctr,aes192-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc]
debug3: cipher ok: aes128-ctr [aes256-ctr,aes128-ctr,aes128-ctr,aes192-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc]
debug3: cipher ok: aes192-ctr [aes256-ctr,aes128-ctr,aes128-ctr,aes192-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc]
debug3: cipher ok: arcfour256 [aes256-ctr,aes128-ctr,aes128-ctr,aes192-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc]
debug3: cipher ok: arcfour128 [aes256-ctr,aes128-ctr,aes128-ctr,aes192-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc]
debug3: cipher ok: aes128-cbc [aes256-ctr,aes128-ctr,aes128-ctr,aes192-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc]
debug3: cipher ok: 3des-cbc [aes256-ctr,aes128-ctr,aes128-ctr,aes192-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc]
debug3: ciphers ok: [aes256-ctr,aes128-ctr,aes128-ctr,aes192-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc]
debug2: mac_setup: found hmac-sha1
debug3: mac ok: hmac-sha1 [hmac-sha1]
debug3: macs ok: [hmac-sha1]
debug1: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to 10.23.66.193 [10.23.66.193] port 22.
debug2: fd 3 setting O_NONBLOCK
debug1: fd 3 clearing O_NONBLOCK
debug1: Connection established.
debug3: timeout: 125163520 ms remain after connect
debug1: permanently_set_uid: 0/0
debug3: Not a RSA1 key file /root/.ssh/id_rsa.
debug2: key_type_from_name: unknown key type '-----BEGIN'
debug3: key_read: missing keytype
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug2: key_type_from_name: unknown key type '-----END'
debug3: key_read: missing keytype
debug1: identity file /root/.ssh/id_rsa type 1
debug1: identity file /root/.ssh/id_dsa type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.3
debug1: match: OpenSSH_5.3 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.1
debug2: fd 3 setting O_NONBLOCK
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: aes256-ctr,aes128-ctr,aes128-ctr,aes192-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc
debug2: kex_parse_kexinit: aes256-ctr,aes128-ctr,aes128-ctr,aes192-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc
debug2: kex_parse_kexinit: hmac-sha1
debug2: kex_parse_kexinit: hmac-sha1
debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib
debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib@openssh.com
debug2: kex_parse_kexinit: none,zlib@openssh.com
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: mac_setup: found hmac-sha1
debug1: kex: server->client aes256-ctr hmac-sha1 none
debug2: mac_setup: found hmac-sha1
debug1: kex: client->server aes256-ctr hmac-sha1 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<4096<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug2: dh_gen_key: priv key bits set: 246/512
debug2: bits set: 2090/4096
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug3: check_host_in_hostfile: filename /dev/null
debug3: check_host_in_hostfile: filename /etc/ssh/ssh_known_hosts
Warning: Permanently added '10.23.66.193' (RSA) to the list of known hosts.
debug2: bits set: 2054/4096
debug1: ssh_rsa_verify: signature correct
debug2: kex_derive_keys
debug2: set_newkeys: mode 1
debug2: cipher_init: set keylen (16 -> 32)
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug2: set_newkeys: mode 0
debug2: cipher_init: set keylen (16 -> 32)
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug2: key: /root/.ssh/id_rsa (0x7f774b53da00)
debug2: key: /root/.ssh/id_dsa ((nil))
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug3: start over, passed a different list publickey,gssapi-keyex,gssapi-with-mic,password
debug3: preferred publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Offering public key: /root/.ssh/id_rsa
debug3: send_pubkey_test
debug2: we sent a publickey packet, wait for reply
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug1: Trying private key: /root/.ssh/id_dsa
debug3: no such identity: /root/.ssh/id_dsa
debug2: we did not send a packet, disable method
debug3: authmethod_lookup password
debug3: remaining preferred: ,password
debug3: authmethod_is_enabled password
debug1: Next authentication method: password
debug3: packet_send2: adding 64 (len 56 padlen 8 extra_pad 64)
debug2: we sent a password packet, wait for reply
debug1: Authentication succeeded (password).
debug2: fd 6 setting O_NONBLOCK
debug2: fd 7 setting O_NONBLOCK
debug2: fd 8 setting O_NONBLOCK
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug1: Requesting no-more-sessions@openssh.com
debug1: Entering interactive session.
tcgetattr: Invalid argument
debug2: callback start
debug2: client_session2_setup: id 0
debug2: channel 0: request pty-req confirm 1
debug1: tty_make_modes: no fd or tio
debug1: Sending environment.
debug3: Ignored env LESSKEY
debug3: Ignored env MANPATH
debug3: Ignored env INFODIR
debug3: Ignored env NNTPSERVER
debug3: Ignored env HOSTNAME
debug3: Ignored env XKEYSYMDB
debug3: Ignored env SHELL
debug3: Ignored env TERM
debug3: Ignored env HOST
debug3: Ignored env XDG_SESSION_COOKIE
debug3: Ignored env HISTSIZE
debug3: Ignored env PROFILEREAD
debug3: Ignored env MORE
debug3: Ignored env USER
debug3: Ignored env LS_COLORS
debug3: Ignored env XNLSPATH
debug3: Ignored env ENV
debug3: Ignored env HOSTTYPE
debug3: Ignored env TMOUT
debug3: Ignored env FROM_HEADER
debug3: Ignored env PAGER
debug3: Ignored env CSHEDIT
debug3: Ignored env XDG_CONFIG_DIRS
debug3: Ignored env MINICOM
debug3: Ignored env PATH
debug3: Ignored env MAIL
debug3: Ignored env CPU
debug3: Ignored env PWD
debug3: Ignored env INPUTRC
debug1: Sending env LANG = POSIX
debug2: channel 0: request env confirm 0
debug3: Ignored env PYTHONSTARTUP
debug3: Ignored env HOME
debug3: Ignored env SHLVL
debug3: Ignored env OSTYPE
debug3: Ignored env LESS_ADVANCED_PREPROCESSOR
debug3: Ignored env LS_OPTIONS
debug3: Ignored env LOGNAME
debug3: Ignored env MACHTYPE
debug3: Ignored env LESS
debug1: Sending env LC_CTYPE = en_US.UTF-8
debug2: channel 0: request env confirm 0
debug3: Ignored env XDG_DATA_DIRS
debug3: Ignored env LESSOPEN
debug3: Ignored env INFOPATH
debug3: Ignored env LESSCLOSE
debug3: Ignored env G_BROKEN_FILENAMES
debug3: Ignored env COLORTERM
debug3: Ignored env mc
debug3: Ignored env _
debug2: channel 0: request shell confirm 1
debug2: fd 3 setting TCP_NODELAY
debug2: callback done
debug2: channel 0: open confirm rwindow 0 rmax 32768
debug2: channel_input_confirm: type 99 id 0
debug2: PTY allocation request accepted on channel 0
debug2: channel 0: rcvd adjust 2097152
debug2: channel_input_confirm: type 99 id 0
debug2: shell request accepted on channel 0
debug2: channel 0: read<=0 rfd 6 len 0
debug2: channel 0: read failed
debug2: channel 0: close_read
debug2: channel 0: input open -> drain
debug2: channel 0: ibuf empty
debug2: channel 0: send eof
debug2: channel 0: input drain -> closed
不同之处在于冻结的日志较短，只有几行。缺少的第一行是：
debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
我尝试了多个版本的SSH，但是如果你想知道这个例子我使用的是OpenSSH_5.1p1客户端和OpenSSH_5.3p1服务器版本。
任何想法都错了，或者我如何解决这个问题，我们表示赞赏。
谢谢！
答案 0 :(得分：2)
这种行为的一个可能原因是，您实际上充斥着ssh个连接的服务器，实际上导致了denial of service，或者您正在看到设置了反DOS措施的后果在远程服务器上。要对此进行排除，请在循环中插入sleep。
如果您可以访问远程主机上ssh服务器的日志，则应该可以找到更多信息。如果不这样做，您可以尝试在调试模式下在更高端口上启动SSH服务器，例如/usr/sbin/sshd -D -e -p 1234（然后与ssh -p 1234联系），以便您获得更准确的信息。