Hello. There is a problem with the newest version of php7.1 packages. It gives error:
2017/02/17 20:28:34 [error] 3434#3434: *259 FastCGI sent in stderr: "PHP message: PHP Fatal error: Uncaught Exception: Could not gather sufficient random data in /var/www/phpBB3/includes/functions.php:99 Stack trace: #0 /var/www/phpBB3/includes/functions.php(99): random_bytes(8) #1 /var/www/phpBB3/phpbb/session.php(806): unique_id() #2 /var/www/phpBB3/phpbb/session.php(493): phpbb\session->session_create() #3 /var/www/phpBB3/viewtopic.php(26): phpbb\session->session_begin() #4 {main} thrown in /var/www/phpBB3/includes/functions.php on line 99"

It's caused by: php/php-src#2385
(packages compiled with the newer kernel versions are incompatible due to getrandom() changes).
Could you please apply the fix for this problem and release an update?