Hi, I have tried to install a SSH Load Average sensor for a Linuxserver and I get this errormessage: "The negotiation of host key verification algorithm is failed". When I try to connect with putty, the ssh-connection works. Can you say me what is going wrong?

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Hello Jens,

I guess your SSHd-Service does not provide the needed cipher to get the PRTG-SSH-Sensor started properly. To determine what cipher is missed, take a look at the dmesg-output on the monitored system while the PRTG-SSH-Sensor tries to connect:

  1. On the Linux-console you should use the dmesg-command e.g. "dmesg|grep sshd" (further information with " man dmesg")
  2. Please search for lines similar to: 
sshd[1914]: [ID 800047 auth.crit] fatal: Client and server could not agree on a common cipher: client "blowfish-cbc,cast128-cbc,aes128-cbc,3des-cbc", server "aes128-ctr,aes192-ctr,aes256-ctr,arcfour128,arcfour256,arcfour".

Oct, 2010 - Permalink