Оптимизайка

Google Authenticator, TOTP protocol

Clear temp files:

./artisan clear-compiled && ./artisan auth:clear-resets && ./artisan cache:clear && ./artisan config:clear && ./artisan route:clear && rm -f storage/framework/sessions/* && rm -f storage/framework/views/* && rm -f storage/logs/*

Edit configuration file:

vi .env

Run locally

./artisan serve

Or deploy to hosting

http://stackoverflow.com/questions/13040246/select-random-row-from-a-postgresql-table-with-weighted-row-probabilities

Google DSP

show your /var/log/php5-fpm.log too, plz

Have you disabled bitrix security settings?

Show your nginx config and php-fpm config. It seems that nginx limit connections module is used.

All of the really effective medicines are banned in Russia, sorry :)

Yes, you can. Ensure that open_basedir does not prohibit it.

RewriteCond %{QUERY_STRING} ^search_field=(.*)(?:%20|\+)(.*)$

RewriteRule ...

https://httpd.apache.org/docs/2.4/programs/ab.html

-k

Enable the HTTP KeepAlive feature, i.e., perform multiple requests within one HTTP session. Default is no KeepAlive.