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The purpose of the known_hosts file is for the client to authenticate the server they are connecting to. Offending key in /home/user/.ssh/known_hosts:1 RSA host key for has changed and you have requested strict checking. Add correct host key in /home/user/.ssh/known_hosts to get rid of this message. Please contact your system administrator. Sometimes when connecting to a computer with SSH, things can get jumbled up and an error can occur that looks like this: WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! Someone could be eavesdropping on you right now (man-in-the-middle attack)! It is also possible that the RSA host key has just been changed. Warning: Trying to access array offset on value of type null in nodeaccess_node_access() (line 276 of sites/all/modules/nodeaccess/nodeaccess.module).Warning: Undefined array key "rid" in nodeaccess_node_access() (line 276 of sites/all/modules/nodeaccess/nodeaccess.module).Warning: Trying to access array offset on value of type null in nodeaccess_node_access() (line 275 of sites/all/modules/nodeaccess/nodeaccess.module).Warning: Undefined array key "rid" in nodeaccess_node_access() (line 275 of sites/all/modules/nodeaccess/nodeaccess.module).