scp without known_hosts check
scp is supposed to take the same command line options as ssh, try: -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null Maybe add -q to disable the warnings as well.
ssh
How do I do Multihop SCP transfers between machines?
You can add -o options to scp instead of .ssh/config. scp -o ProxyCommand=”ssh $jump_host nc $host 22″ $local_path $host:$destination_path $jump_host is your “server B” in this case.
Login without running bash_profile or bashrc
I think your only options are: ssh in as another user and su to your account; use something like ftp or smbclient, if the relevant services are enabled on the host; find an open vulnerability in an open network service and exploit it :). get an admin to fix the problem.
Why does my OpenSSH key fingerprint not match the AWS EC2 console keypair fingerprint?
AWS EC2 shows the SSH2 fingerprint, not the OpenSSH fingerprint everyone expects. It doesn’t say this in the UI. It also shows two completely different kinds of fingerprints depending on whether the key was generated on AWS and downloaded, or whether you uploaded your own public key. Fingerprints generated with ssh-keygen -l -f id_rsa will … Read more
SFTP logging: is there a way?
OpenSSH versions 4.4p1 and up (which should include the latest version with CentOS 5) have SFTP logging capability built in – you just need to configure it. Find this in your sshd_config (in centos, file /etc/ssh/sshd_config): Subsystem sftp /usr/libexec/openssh/sftp-server and change it to: Subsystem sftp /usr/libexec/openssh/sftp-server -l INFO INFO is just one level of detail … Read more
How to recover from “Too many Authentication Failures for user root”
Are you sure that root login to ssh is allowed? Check sshd_config and verify that root login is permitted. sshd will need to be restarted if the setting changes.
How can I prevent the warning No xauth data; using fake authentication data for X11 forwarding?
None of the posted solutions worked for me. My client (desktop) system is running macOS 10.12.5 (Sierra). I added -v to the options for the ssh command and it told me, debug1: No xauth program. which means it doesn’t have a correct path to the xauth program. (On this version of macOS the path to … Read more
SSH Suddenly returning Invalid format
Check the contents of key_name, if the agent says invalid format, then there’s something wrong with the key – like .. are you sure that’s the correct key? Even if it’s not the private key you need, the ssh agent won’t return invalid format if the key is working, you simply won’t be able to … Read more
What significance does the user/host at the end of an SSH public key file hold?
This field is a comment, and can be changed or ignored at will. It is set to user@host by default by ssh-keygen. The OpenSSH sshd(8) man page describes the format of a public key thus: Public keys consist of the following space-separated fields: options, keytype, base64-encoded key, comment. . . . The comment field is … Read more
OpenSSH: Difference between internal-sftp and sftp-server
Both sftp-server and internal-sftp are part of OpenSSH. The sftp-server is a standalone binary. The internal-sftp is just a configuration keyword that tells sshd to use the SFTP server code built-into the sshd, instead of running another process (what would typically be the sftp-server). The internal-sftp was added much later (OpenSSH 4.9p1 in 2008?) than … Read more