It seems your remote host require one of diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 algorithms, but unfortunately, they were deprecated and disabled by default.
Please edit your profile settings, and set KexAlgorithms to +diffie-hellman-group1-sha1:
I would recommend you change to other more secured algorithms at server end once you get a chance.
Kindly Regards,
Yang