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Author Topic: Cannot connect via Synapse and SSH to a linux box  (Read 11484 times)

big_mama

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  • Posts: 3
Re: Cannot connect via Synapse and SSH to a linux box
« Reply #60 on: April 14, 2017, 01:41:12 am »
Since I only found this thread when googling for "Technical details: No algorithm compatible with the remote system's selection was found:" ...

There seems to be problem with openssh 6.7 upwards and cryptlib 3.4.2.

http://forums.apc.com/spaces/7/ups-management-devices-powerchute-software/forums/general/1785/openssh-v6-7-received-disconnect-handshake-failed/1#6079

My program used to work perfectly using synapse and cryptlib to connect to an ssh server, until I upgraded my Linux distribution. Reverting back to openssh 6.6 solved the problem for now. Maybe this info will be usefull to someone

Thaddy

  • Hero Member
  • *****
  • Posts: 4638
Re: Cannot connect via Synapse and SSH to a linux box
« Reply #61 on: April 14, 2017, 06:30:20 am »
"The probably easies workaround for now is to force the use of MD5 to make SSH request only a 3076 bit DH key.

This can be done using the "-m hmac-md5" command line flag or "MACs hmac-md5" config option."

WTF? Chillingly bad advice. Don't use that.
"Logically, no number of positive outcomes at the level of experimental testing can confirm a scientific theory, but a single counterexample is logically decisive."

 

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