Yes it is surprise: I look some item on my forum and see "Эта тема закрыта. Ответы больше не принимаются." (sorry for Russian).
I want to block this possibility to close post and I would like have all posts open for comments always. How to do it?

Do you have the option $userUnlock=0; in setup_options.php ? Then your users can close their own posts and you see the message described.

From the manual:
$userUnlock=0; If it is set to 0, registered user can not unlock his topic again after it was locked (by admin or himself), and vice versa. If set to 2, users are not able to lock their topics in general (avail. from ver. 2.0 RC3).

Thank you very much!
What is means in this content?

By the way, when I placed my own post I had no option to lock comments but, other user had option to lock.
How does it look? What kind of operation he made to lock?

И наоборот ? .. if that is the correct translation for you :)

Set $userUnlock=2; then only the admin or mods can close an topic.

yes, translation I saw by Google but, what means vice versa in this case:
?

cleargoal - You can lock an topic and ... vice versa? ... I think .. unlock ;-) Right? So anyway, i would explain it ..

Jaime thanks for your kindness and patience! But, So, that 'vice versa' is not simple to understand. However, it's linguistic and now for me the sense is clear. I setup $userUnlock=2; and I'm ready to finish this conversation.

Is this some kind of outdated expression? I've never heard this before