Hi! I have no idea, how  to use ssh keys for sftp server. At first,there no "All files" in this drop down menu, and second, I don't use passphrase for my key and can't skip it

What does the error next to the field say?

Different certificate types need to be processed differently.  LogViewPlus supports certificate file types *.ppk, *.p12 and *.pfx.  LogViewPlus uses the file extension to make decisions about the type of certificate it needs to handle (*.p12 and *.pfx are considered to be x.509). 

I will add the supported file types to the "Security Certificates" prompt.  Thanks for pointing this out.

Toby

oh, i use ssh key pair, but it is not even supported ? I am sorry
total 64
-rwxrwxrwx 1 trak trak 1421 Sep 1 2016 authorized_keys
-rwxrwxrwx 1 trak trak 2440 Jun 22 2020 config
drwxrwxrwx 1 trak trak 512 Oct 27 2019 hostkeys
-rwxrwxrwx 1 trak trak 6367 Sep 1 2016 id_rsa
-rwxrwxrwx 1 trak trak 6367 Sep 1 2016 id_trak2016
-rwxrwxrwx 1 trak trak 1421 Sep 1 2016 id_trak2016.pub
-rwxrwxrwx 1 trak trak 35334 Feb 16 10:48 known_hosts
$ file id_trak2016
id_trak2016: PEM RSA private key

We also need to make it more clear what types are supported.  I have already added the file types list to the file browser and it will be in the next release - thanks again for pointing this out.

If you have a pem file, I believe you can use PuttyGen to convert it into a ppk file. If you do not have puttygen already installed, I would recommend downloading it from the official site as part of the standard Putty install.

Thanks again,

Toby