Topic: After Roundcube Update "502 Bad Gateway" error.
Just have to copy the old config to the new config. Restart phpxxx-fpm. In my case it was 7.4 to 8.1.
cd /etc/php/8.1/fpm/pool.d
cp ../../../7.4/fpm/pool.d/www.conf .
service php8.1-fpm restart
Fixed!
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