FTP Issue while installing plugin

I have installed plugins before and in fact update one just an hour back with fs method as ssh2 and the ftp user, ftp host and ftp password lines in my wp-config

I have even installed WPMU plugins with the existing settings.. but his morning I get the attached screenshot message.. so I thought it was wierd that it's asking for lines which already exist.. anyways I try to key in my username and password but the fields seem read only and don't allow me to key in my user name and password.. it only allows me to submit and then for the next 15 minutes i think I don't even get this option and only the error message which is 'failed to connect to ssh2 server'