https://community.ruckuswireless.com/t5/ICX-Switches/Error-The-first-key-exchange-algorithm-supported-by-the-server/m-p/15038#M378 Answered myself<BR />(config)#ip ssh key-exchange-method dh-group14-sha1 Tue, 10 Jul 2018 23:12:12 GMT nbctcp 2018-07-10T23:12:12Z https://community.ruckuswireless.com/t5/ICX-Switches/Error-The-first-key-exchange-algorithm-supported-by-the-server/m-p/15037#M377 I have old FCX 6485.<BR />Every time I connect through putty. I got error above.<BR />I can solve that using this method<BR /><A href="https://nbctcp.wordpress.com/2018/02/01/error-the-first-key-exchange-algorithm-supported-by-the-server-is-diffie-hellman-group1-sha1/" rel="nofollow" title="Link: https://nbctcp.wordpress.com/2018/02/01/error-the-first-key-exchange-algorithm-supported-by-the-server-is-diffie-hellman-group1-sha1/">https://nbctcp.wordpress.com/2018/02/01/error-the-first-key-exchange-algorithm-supported-by-the-serv...</A><BR /><BR />QUESTIONS:<BR />1. any better method to solve that<BR /><BR />tq<BR /><BR />======<BR />#sh ip ssh config<BR />SSH server&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;: Enabled<BR />SSH port&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;: tcp\22<BR />Host Key&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;:&nbsp;&nbsp;RSA 2048<BR />Encryption&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;: AES-256, AES-192, AES-128, 3-DES<BR />Permit empty password&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;: No<BR />Authentication methods&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;: Password, Public-key, Interactive<BR />Authentication retries&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;: 2<BR />Login timeout (seconds)&nbsp;&nbsp;&nbsp;&nbsp;: 30<BR />Idle timeout (minutes)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;: 30<BR />Strict management VRF&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;: Disabled<BR />SCP&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;: Disabled<BR />SSH IPv4 clients&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;: All<BR />SSH IPv6 clients&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;: All<BR />SSH IPv4 access-group&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;: 10<BR />SSH IPv6 access-group&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;:<BR />SSH Client Keys&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;:<BR /><BR />#sh flash<BR />Stack unit 1:<BR />&nbsp; Compressed Pri Code size = 10539581, Version:08.0.30sT7f3 (FCXR08030s.bin)<BR />&nbsp; Compressed Sec Code size = 10539581, Version:08.0.30sT7f3 (FCXR08030s.bin)<BR />&nbsp; Compressed Boot-Monitor Image size = 370695, Version:10.1.00T7f5<BR />&nbsp; Code Flash Free Space = 43515904 Tue, 10 Jul 2018 19:33:18 GMT https://community.ruckuswireless.com/t5/ICX-Switches/Error-The-first-key-exchange-algorithm-supported-by-the-server/m-p/15037#M377 nbctcp 2018-07-10T19:33:18Z https://community.ruckuswireless.com/t5/ICX-Switches/Error-The-first-key-exchange-algorithm-supported-by-the-server/m-p/15038#M378 Answered myself<BR />(config)#ip ssh key-exchange-method dh-group14-sha1 Tue, 10 Jul 2018 23:12:12 GMT https://community.ruckuswireless.com/t5/ICX-Switches/Error-The-first-key-exchange-algorithm-supported-by-the-server/m-p/15038#M378 nbctcp 2018-07-10T23:12:12Z