SFTP problem - Its locks other connexions

[speedycool]

Hello everybody
I had private keys for SFTP configuration. When I had 5 keys, all the connexions where OK.
If I add a 6th private key, the others connexions ( non SFTP ) doesn't work anymore. The message is :

Server sent disconnect message
type 2 (protocol error):
"Too many authentication failures for xxxxxx"
If i Delete the 6th key, it works.

The version is Filezilla 3.3.2.1

[Alexander Schuch]

Please refer to the more sophisticated report at #5480.