1. Create my mod https://www117.zippyshare.com/v/csIu8MrS/file.html
2. Add a parameter -mod=@My_Server_Mod in server batch
3. Set up a cfg parameters:

verifySignatures = 2;

3. Start server
4. Disable all mods in client game launcher
5. Add a connect to server in start game (-connect= -port=)
6. Start game
7. I am a niormal connect to server without mods
8. Disable server.
9. Check a server logs, my server mod is worked (text "TEST MY SERVER MOD" existed in server script log)
10. Create a own key and secure my pbo file mod

https://www3.zippyshare.com/v/yMbFM1Bx/file.html

11. Retry 2-6 stage again
12. I am connected the normal withoout kicking

If you add and remove a server parameter
equalModRequired = 1;
then the situation does not change, the server is still allowed in any case.

I also noticed the following, checked on a clean server without mods and scripts with signature checking enabled (parameter verifysignatures=2;):

1. Unpack scripts.pbo in the server's dta folder
2. Move the scripts folder to the root folder of the server
3. Add the-FilePatching parameter to the server startup parameters
4. Try logging in to the server
5. I am will be kicked from server for changing scripts.pbo (i am don't change this file. In clear servers and official server i am can play normal)