我无法连接到使用SSH创建的任何实例。我甚至无法Ping这些实例（启用了ICMP）。
如果我停止实例并再次启动它，我可以用SSH连接大约60秒，然后我收到错误：“连接重置”。
我有适当的SSH配置，一周前为我工作。在一个例子中，我允许来自任何地方的所有流量。还是不能ping。我的Port 22 Connection超时了。 我尝试了不同的互联网连接，主机。我为Amazon / Ubuntu AMI获得了相同的错误。
请查看底部的日志。 在附加的日志中，我查看了ssh配置文件，但没有更改任何内容。我试着获得一些调试信息。 我在2-3个其他实例上尝试了一些不同的东西，包括SSHD配置文件中的一些配置，没有任何效果。 谢谢！
连接错误示例： 甲
$ ssh -i "ec2_key2.pem" ubuntu@ec2-52-90-56-88.compute-1.amazonaws.com
ssh: connect to host ec2-52-90-56-88.compute-1.amazonaws.com port 22: Connection timed out
乙
chinmay@ubuntu:~/AWS$ ssh -Xvvv -i "ec2_key2.pem" ec2-user@ec2-54-147-245-230.compute-1.amazonaws.com
OpenSSH_6.6.1, OpenSSL 1.0.1f 6 Jan 2014
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to ec2-54-147-245-230.compute-1.amazonaws.com [54.147.245.230] port 22.
debug1: connect to address 54.147.245.230 port 22: Connection refused
ssh: connect to host ec2-54-147-245-230.compute-1.amazonaws.com port 22: Connection refused
LOG附件： 登录Amazon AMI实例。大约60秒后连接重置。 我可以停止实例，重新启动它，并将其连接大约一分钟。
$ ssh -vvv -i "standard_aws_ec2.pem" ec2-user@ec2-54-159-105-2.compute-1.amazonaws.com
OpenSSH_7.5p1, OpenSSL 1.0.2l 25 May 2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug2: resolving "ec2-54-159-105-2.compute-1.amazonaws.com" port 22
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to ec2-54-159-105-2.compute-1.amazonaws.com [54.159.105.2] port 22.
debug1: Connection established.
debug1: key_load_public: No such file or directory
debug1: identity file standard_aws_ec2.pem type -1
debug1: key_load_public: No such file or directory
debug1: identity file standard_aws_ec2.pem-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.5
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.4
debug1: match: OpenSSH_7.4 pat OpenSSH* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to ec2-54-159-105-2.compute-1.amazonaws.com:22 as 'ec2-user'
debug3: hostkeys_foreach: reading file "/c/Users/chinm/.ssh/known_hosts"
debug3: send packet: type 20
debug1: SSH2_MSG_KEXINIT sent
debug3: receive packet: type 20
debug1: SSH2_MSG_KEXINIT received
debug2: local client KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,ext-info-c
debug2: host key algorithms: ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ssh-ed25519-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-cbc,aes192-cbc,aes256-cbc
debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-cbc,aes192-cbc,aes256-cbc
debug2: MACs ctos: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,zlib@openssh.com,zlib
debug2: compression stoc: none,zlib@openssh.com,zlib
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug2: peer server KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: host key algorithms: ssh-rsa,rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256,ssh-ed25519
debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-cbc,aes192-cbc,aes256-cbc,blowfish-cbc,cast128-cbc,3des-cbc
debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-cbc,aes192-cbc,aes256-cbc,blowfish-cbc,cast128-cbc,3des-cbc
debug2: MACs ctos: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,zlib@openssh.com
debug2: compression stoc: none,zlib@openssh.com
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: kex: client->server cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug3: receive packet: type 31
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:ni9r3f3A8dvyLH655cub1AVvuCKywoTQ3Hyz7ZALZiw
debug3: hostkeys_foreach: reading file "/c/Users/chinm/.ssh/known_hosts"
debug3: hostkeys_foreach: reading file "/c/Users/chinm/.ssh/known_hosts"
The authenticity of host 'ec2-54-159-105-2.compute-1.amazonaws.com (54.159.105.2)' can't be established.
ECDSA key fingerprint is SHA256:ni9r3f3A8dvyLH655cub1AVvuCKywoTQ3Hyz7ZALZiw.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'ec2-54-159-105-2.compute-1.amazonaws.com,54.159.105.2' (ECDSA) to the list of known hosts.
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: receive packet: type 21
debug1: SSH2_MSG_NEWKEYS received
debug2: set_newkeys: mode 0
debug1: rekey after 134217728 blocks
debug2: key: standard_aws_ec2.pem (0x0), explicit
debug3: send packet: type 5
debug3: receive packet: type 7
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<rsa-sha2-256,rsa-sha2-512>
debug3: receive packet: type 6
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug3: send packet: type 50
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey
debug3: start over, passed a different list publickey
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: Trying private key: standard_aws_ec2.pem
debug3: sign_and_send_pubkey: RSA SHA256:myqjI3CrEdes0mQO+Gq9osyyAyO0ONBEjCLYuHAJM10
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 52
debug1: Authentication succeeded (publickey).
Authenticated to ec2-54-159-105-2.compute-1.amazonaws.com ([54.159.105.2]:22).
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug3: send packet: type 90
debug1: Requesting no-more-sessions@openssh.com
debug3: send packet: type 80
debug1: Entering interactive session.
debug1: pledge: network
debug3: receive packet: type 80
debug1: client_input_global_request: rtype hostkeys-00@openssh.com want_reply 0
debug3: receive packet: type 91
debug2: callback start
debug2: fd 3 setting TCP_NODELAY
debug3: ssh_packet_set_tos: set IP_TOS 0x10
debug2: client_session2_setup: id 0
debug2: channel 0: request pty-req confirm 1
debug3: send packet: type 98
debug2: channel 0: request shell confirm 1
debug3: send packet: type 98
debug2: callback done
debug2: channel 0: open confirm rwindow 0 rmax 32768
debug3: receive packet: type 99
debug2: channel_input_status_confirm: type 99 id 0
debug2: PTY allocation request accepted on channel 0
debug2: channel 0: rcvd adjust 2097152
debug3: receive packet: type 99
debug2: channel_input_status_confirm: type 99 id 0
debug2: shell request accepted on channel 0
Last login: Sun Nov 26 02:10:49 2017 from 198.21.199.65
__| __|_ )
_| ( / Amazon Linux AMI
___|\___|___|
https://aws.amazon.com/amazon-linux-ami/2017.09-release-notes/
4 package(s) needed for security, out of 20 available
Run "sudo yum update" to apply all updates.
[ec2-user@ip-172-31-93-53 ~]$ ssh -i "standard_aws_ec2.pem" ec2-user@ec2-54-159-105-2.compute-1.amazonaws.com^C
[ec2-user@ip-172-31-93-53 ~]$ sudo sudo ufw allow 22
sudo: ufw: command not found
[ec2-user@ip-172-31-93-53 ~]$ sudo ufw allow 22
sudo: ufw: command not found
[ec2-user@ip-172-31-93-53 ~]$ yum install ufw
Loaded plugins: priorities, update-motd, upgrade-helper
You need to be root to perform this command.
[ec2-user@ip-172-31-93-53 ~]$ sudo yum install ufw
Loaded plugins: priorities, update-motd, upgrade-helper
No package ufw available.
Error: Nothing to do
[ec2-user@ip-172-31-93-53 ~]$ sudo vim
[ec2-user@ip-172-31-93-53 ~]$ sudo vim /etc/ss
ssh/ ssl/
[ec2-user@ip-172-31-93-53 ~]$ sudo vim /etc/ss
ssh/ ssl/
[ec2-user@ip-172-31-93-53 ~]$ sudo vim /etc/ssh/
moduli ssh_host_dsa_key.pub ssh_host_ed25519_key.pub
ssh_config ssh_host_ecdsa_key ssh_host_rsa_key
sshd_config ssh_host_ecdsa_key.pub ssh_host_rsa_key.pub
ssh_host_dsa_key ssh_host_ed25519_key
[ec2-user@ip-172-31-93-53 ~]$ sudo vim /etc/ssh/
moduli ssh_host_dsa_key.pub ssh_host_ed25519_key.pub
ssh_config ssh_host_ecdsa_key ssh_host_rsa_key
sshd_config ssh_host_ecdsa_key.pub ssh_host_rsa_key.pub
ssh_host_dsa_key ssh_host_ed25519_key
[ec2-user@ip-172-31-93-53 ~]$ sudo vim /etc/ssh/ssh
ssh_config ssh_host_ecdsa_key ssh_host_rsa_key
sshd_config ssh_host_ecdsa_key.pub ssh_host_rsa_key.pub
ssh_host_dsa_key ssh_host_ed25519_key
ssh_host_dsa_key.pub ssh_host_ed25519_key.pub
[ec2-user@ip-172-31-93-53 ~]$ sudo vim /etc/ssh/ssh
ssh_config ssh_host_ecdsa_key ssh_host_rsa_key
sshd_config ssh_host_ecdsa_key.pub ssh_host_rsa_key.pub
ssh_host_dsa_key ssh_host_ed25519_key
ssh_host_dsa_key.pub ssh_host_ed25519_key.pub
[ec2-user@ip-172-31-93-53 ~]$ sudo vim /etc/ssh/ssh
ssh_config ssh_host_ecdsa_key ssh_host_rsa_key
sshd_config ssh_host_ecdsa_key.pub ssh_host_rsa_key.pub
ssh_host_dsa_key ssh_host_ed25519_key
ssh_host_dsa_key.pub ssh_host_ed25519_key.pub
[ec2-user@ip-172-31-93-53 ~]$ sudo vim /etc/ssh/sshd_config
[ec2-user@ip-172-31-93-53 ~]$ sudo netstat -anp | grep sshd
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 2474/sshd
tcp 0 36 172.31.93.53:22 198.21.199.65:52145 ESTABLISHED 2595/sshd
tcp 0 0 :::22 :::* LISTEN 2474/sshd
unix 2 [ ] DGRAM 11314 2595/sshd
unix 3 [ ] STREAM CONNECTED 11318 2595/sshd
unix 3 [ ] STREAM CONNECTED 11317 2597/sshd
[ec2-user@ip-172-31-93-53 ~]$ debug3: send packet: type 1
Connection reset by 54.159.105.2 port 22
答案 0 :(得分：0)
我没有你的问题的答案，但我有一些你可以尝试的建议，让我知道他们是否有效：
1）由于不活动，会话可能会超时吗？尝试：ssh -o "ServerAliveInterval 40"或将ServerAliveInterval 40添加到您的ssh配置文件中。
2）尝试检索sshd的日志以查看最新情况。
3）你能仔细检查你的酒吧/私钥吗？我在过去使用过错键时看到连接拒绝错误。
4）亚马逊有一系列可以尝试解决connection timed out问题的内容：http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/TroubleshootingInstancesConnecting.html#TroubleshootingInstancesConnectionTimeout