no matching key exchange method found. Their offer: diffie-hellman-group1-sha1
Unable to ssh into EXOS network switch from ssh Jumphost, the error Message on the SSH Client is....
Unable to negotiate with ip on port 22: no matching key exchange method found. Their offer: diffie-hellman-group1-sha1
The reason for the above error is because the support for diffie-hellman-group1-sha1 had been removed from OpenSSH and other SSH libraries by default. Try to upgrade your switch firmware and see if that solves your problem.