If you are running mod_php you may experience problems with big uploads and imports (or other long running processes).
You can adjust php’s default timeouts using a .htaccess file.
Create a file called .htaccess and put the code:
# increase php time-out limits
php_value max_execution_time 1000
php_value max_input_time 1000
inside it. Put the .htaccess file into the top-most directory of your site. If you already have a .htaccess
file, add the code above to the end of it.
This should solve you problem in most cases.
If it does not, try to increase the times (1000). If the problem persists, open a support ticket and include the URL, click path and any needed usernames and passwords. We will duplicate the problem and attempt to adjust your php execution times to make your script work.
Note: if you are running php as a cgi, you’ll need to adjust your /etc/php.ini file. Adding directives to .htaccess files has no effect on installs using php-cgi.