FeedSync Session Path Issue
Some sites when migrated from another hosting environment may make errors with the session_path option.
Check that the .htaccess file in your root WordPress directory doesn't have some customised session.save_path causing issues. If it does create a new .htaccess file in the /feedsync folder to replace the WordPress options.
Example of a new .htaccess file:
<IfModule php7_module> php_flag display_errors Off php_value max_execution_time 600 php_value max_input_time 60 php_value max_input_vars 1000 php_value memory_limit 256M php_value post_max_size 8G php_value session.gc_maxlifetime 1440 php_value session.save_path "/home/burmeste/tmp" php_value upload_max_filesize 8G php_flag zlib.output_compression Off </IfModule> <IfModule lsapi_module> php_flag display_errors Off php_value max_execution_time 600 php_value max_input_time 60 php_value max_input_vars 1000 php_value memory_limit 256M php_value post_max_size 8G php_value session.gc_maxlifetime 1440 php_value session.save_path "/home/burmeste/tmp" php_value upload_max_filesize 8G php_flag zlib.output_compression Off </IfModule>
Plesk
you will need to update the session.save_path variable to /var/www/vhosts/YOUR_DOMAIN.com.au/sessions (YOUR_DOMAIN.com.au being the domain on the server).
The new 'sessions' directory which you create will not be available to from the web (as its not in httpdocs) but is in the root of the domain, so, the website can write to and access the file.