This worked for me:
ssh -v admin@172.16.3.253 -o KexAlgorithms=diffie-hellman-group14-sha1
source:
http://stackoverflow.com/questions/25341773/cisco-ssh-key-exchange-fails-from-ubuntu-14-04-client-dh-key-range-mismatch
This worked for me:
ssh -v admin@172.16.3.253 -o KexAlgorithms= diffie- hellman- group14- sha1
source:
http:// stackoverflow. com/questions/ 25341773/ cisco-ssh- key-exchange- fails-from- ubuntu- 14-04-client- dh-key- range-mismatch