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Last Reviewed: March 18, 2020

Timeouts on Pantheon

Detailed information about timeout errors on your site.

Rules are for the good of the group, and timeouts are no exception. Timeouts are configured to fit normal program execution.

When troubleshooting timeout errors, first verify that the timeout is not caused by idle application containers. Sometimes timeouts can be reached when working with inefficient code or when attempting to execute a long-running job that would be better suited for Terminus.

User-Configurable Timeouts

PHP max_execution_time120 SecondsMaximum time a script can run before being terminated by the parser. This includes Drush & WP-CLI commands. Helps prevent poorly written scripts from tying up your application container's PHP workers.
You can edit this timeout via settings.php or wp-config.php. Scripts executed through the GlobalCDN will still be restricted by the 59 second connection timeout.
Solr5 SecondsTypically reached if you try to index too much at once (use a reasonable batch size and avoid indexing large binary files).

Timeouts That are not Configurable

Connection Timeout59 secondsNumber of seconds to wait for a timeout.
First Byte Timeout59 secondsNumber of seconds to wait for the first byte.
Between Bytes Timeout59 secondsNumber of seconds to wait for between bytes.
Pantheon executed Drupal cron180 secondsOnly applies to Pantheon's automatic hourly execution of Drush cron.
PHP set_time_limit120 secondsNumber of seconds a script can run. If reached, the script returns a fatal error.
Load Balancer120 secondsApplies to HTTPS requests and requests to a DNS A record. Requests using the Pantheon CNAME for HTTP requests are not limited.
SSH10 minutes idleApplies to remote Drush and WP-CLI commands, SSH tunneling, SFTP, rsync.
MySQL net_write_timeout90 secondsNumber of seconds to wait for a block to be written to a connection before aborting the write.
MySQL net_read_timeout90 secondsNumber of seconds to wait for more data from a connection before aborting the read.
MySQL wait_timeout420 secondsNumber of seconds the server waits for activity on a non-interactive connection before closing it.
MySQL interactive_timeout420 secondsNumber of seconds the server waits for activity on an interactive connection before closing it.
Nginx fastcgi_read_timeout900 secondsPHP won't run forever.

Frequently Asked Questions

Why is the timeout still set to 59 seconds, after setting up the time out for 120 seconds?

All web requests are set to 59 seconds. Fastly's GCDN terminates the request if the backend does not respond after 59 seconds. PHP will continue to process the request until it hits the PHP max_execution_time, however the results will not be relayed to the user browser, because the connection has already terminated.

All non-web requests, such as those that do not pass Fastly's CDN, have a maximum timeout of 120 seconds. This includes requests from Terminus or PHP scripts via SSH.


If the request passes through port 80 and 443 it will timeout at 59 seconds.

Can I manually run Drupal cron for longer than the Pantheon executed Drupal cron?

Yes, use the command terminus drush <site>.<env> -- cron in Terminus. Most slow cron executions are due to PHP errors or a slow external service. Best practice is to identify and fix the root cause. Check log files and review PHP errors and exceptions for clues.

What if I run into a timeout when using the Drupal Migrate UI?

As recommended in the Migrate module documentation, use Drush, which can be invoked through Terminus.

If you're migrating to a Drupal site, you can also configure Migrate to trigger Drush imports from the UI by configuring the migrate_drush_path variable to:

$conf['migrate_drush_path'] = $_ENV['HOME'] . '/bin/drush';

Can Pantheon change the non-configurable timeouts for my site?

No, these settings apply to every site on Pantheon. One of the ways Pantheon scales so well is by avoiding one-off configurations. We run a highly tuned universal configuration for optimized performance.

How do I change the Solr timeout on Drupal?

Do not edit the pantheon_apachesolr module within your Drupal site installation, it will void your warranty and we can't support user modifications. Instead, reduce the batch size and avoid indexing large binary files.

How do I install a theme or plugin that keeps timing out?

If you receive a The application did not respond in time error when trying to install a theme or plugin, your experience may be affected by a combination of large files and a poor internet connection. Extract the files locally and upload them via SFTP.

Agencies that frequently deploy sites using a common set of themes and plugins should consider creating a custom upstream.

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