Posts tagged SSH

Connecting to legacy servers with OpenSSH

Phasing out legacy cryptographic algorithms can always be an interesting endeavor as terminating to early breaks stuff and to late it can lead to a compromise. OpenSSH disabled DSA with version 7.0 in March 2015 as 5 years earlier it was discovered that DSA was compromised and labelled as insecure. Normally this shouldn’t be a problem with a normal software life cycle, but sometimes you will encounter a legacy box that will not be upgraded as it will break things. Now it will stop new connections being setup from upgraded to machines as with SSH.

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Using explicit SSH authentication methods

For many SSH is a magic sauce to get access to a server and to transfer files between servers. But when things go wrong this magic sauce becomes a problem. Let start with one example when things go wrong and how to debug it. First, we start to add to option -v to our command to connect to another server to get some basic debug information about the SSH handshake and getting to the point the user has to authenticate.

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