colucci-web.it

Maybe the server is configured to allow only one connection for the user

Yes, I'm stupid, sorry...
Question resolved

It seems that problem it’s not a password, but some other parameters ...

The official client on the PC asks for a password at startup with this configuration ...
There are no errors in the log, just "Connection reset, restarting [0]"
https://yadi.sk/i/jwJfLV9LR--Uxw

This is my configuration file (without sensitive data)
https://yadi.sk/d/9cpMB313hU8Q8g

Nothing, first string "-----BEGIN PRIVATE KEY-----", on second begin private key data

In settings no option "Save private key password"
https://yadi.sk/i/kkHGs-GmHX7Zog

On version 1.00.42 don't ask certificate password and permanent reconnection occurs.