SUM SP16 profiles issue (can't save profile)

Dear experts,

I'm trying to set up SUM parameters for my system but there is a step I can't pass through.

When SUM asks me about central instance profiles I input files like this:

However in this case I have strange messages: Please enter a valid path

I have no idea how to deal with this issue:

1) Filenames are absoultely correct and they exist in sid/sys/profiles directory

2) I don't have a start profile as I don't need it

Is there any way to debug this problem? Can it be related somehow yo security srttings of the server?

Thanks!