Netbeans Bug 251641 - Falha na negociação do algoritmo para qualquer conexão SFTP pode se aplicar ao seu problema. A solução no Comentário 5 diz:
Netbeans 7.3 Bets 2 uses JSch library 1.0.45.
This version do not work with OpenSSH 6.7. It works only with OpenSSH 6.6.1 and earlier versions.But JSch library 1.0.52 works with OpenSSH 6.7
- Download this version
- Rename current file to backup
C:\Program Files\NetBeans 7.3 Beta 2\ide\modules\com-jcraft-jsch.jar
rename tocom-jcraft-jsch.jar.1.0.42.bak
.- Copy downloaded
com-jcraft-jsch.jar
of version 1.0.52 to this folder- Restart Netbeans
Bingo!! SSH works again and works with OpenSSH 6.7 servers
O comentário 8 diz:
Thank you! Same problem was in 8.0.2 & OpenSSH 6.7