Title: error 500 when activating plugin Last modified: March 25, 2024 --- # error 500 when activating plugin * Resolved [Eric Malalel](https://wordpress.org/support/users/teachlynx/) * (@teachlynx) * [2 years, 2 months ago](https://wordpress.org/support/topic/error-500-when-activating-plugin-2/) * I run a WordPress 6.4.3 domain based multisite install on a Windows 2019 server running IIS 10 web server configured with FastCGI for PHP scripts. * I have recently updated WP Mail SMTP to version 4.0.1 and I get the following problem. * If I configure FastCGI to use PHP 7.4, everything works fine. * If I configure FastCGI to use PHP 8.2, I get a 500 error as soon as I want to network activate the plugin, and any request to the server gets a 500 error. * Here is the error in IIS log file (I have only hidden the IP and the domain): * 2024-03-25 18:47:24 XXX.XXX.XXX.XXX GET /wp-admin/plugins.php action=activate& plugin=wp-mail-smtp%2Fwp_mail_smtp.php&plugin_status=all&paged=1&s&_wpnonce=14cad7aa19 443 – 81.220.53.30 Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64)+AppleWebKit/537.36 +(KHTML,+like+Gecko)+Chrome/123.0.0.0+Safari/537.36 [https://www.example.com/wp-admin/plugins.php](https://www.example.com/wp-admin/plugins.php) 500 0 3221225477 1253 * The error code 3221225477 is 0xC0000005 in hex, which on Windows is: define STATUS_ACCESS_VIOLATION(( NTSTATUS)0xC0000005L). * I think this is a regression as I did not have the issue with previous versions of your plugin. * This is very annoying as I have customers who require me to use PHP 8.2, so please explain how to fix this, or even better, provide a fix. - This topic was modified 2 years, 2 months ago by [Eric Malalel](https://wordpress.org/support/users/teachlynx/). Viewing 3 replies - 1 through 3 (of 3 total) * Plugin Support [Victoria Sakal](https://wordpress.org/support/users/sakalvictoria/) * (@sakalvictoria) * [2 years, 2 months ago](https://wordpress.org/support/topic/error-500-when-activating-plugin-2/#post-17533598) * Hi, [@teachlynx](https://wordpress.org/support/users/teachlynx/)! * Please check the WordPress debug log to see if there are some errors and share them with us. * Also, please, install WP Mail SMTP v3.11.1 on PHP 8.2 and see if the issue is present. * Thank you. * Plugin Support [Victoria Sakal](https://wordpress.org/support/users/sakalvictoria/) * (@sakalvictoria) * [2 years, 2 months ago](https://wordpress.org/support/topic/error-500-when-activating-plugin-2/#post-17543237) * Hi, [@teachlynx](https://wordpress.org/support/users/teachlynx/)! * We haven’t heard from you for a while so I’m going to close this thread for now. But please feel welcome to reopen it when you can provide the additional details. * Thank you. * Thread Starter [Eric Malalel](https://wordpress.org/support/users/teachlynx/) * (@teachlynx) * [2 years, 2 months ago](https://wordpress.org/support/topic/error-500-when-activating-plugin-2/#post-17544521) * Hi [@sakalvictoria](https://wordpress.org/support/users/sakalvictoria/), * There was no error in PHP log but the Windows Event Viewer finally give me a hint. The 500 error was due to a memory exception in the OPCache PHP optimization module. * I stopped IIS, cleared the OPCache cache directory, adjusted some OPCache settings, and everything is back on track, including your plugin. - This reply was modified 2 years, 2 months ago by [Eric Malalel](https://wordpress.org/support/users/teachlynx/). Viewing 3 replies - 1 through 3 (of 3 total) The topic ‘error 500 when activating plugin’ is closed to new replies. * ![](https://ps.w.org/wp-mail-smtp/assets/icon-256x256.png?rev=1755440) * [WP Mail SMTP by WPForms - The Most Popular SMTP and Email Log Plugin](https://wordpress.org/plugins/wp-mail-smtp/) * [Frequently Asked Questions](https://wordpress.org/plugins/wp-mail-smtp/#faq) * [Support Threads](https://wordpress.org/support/plugin/wp-mail-smtp/) * [Active Topics](https://wordpress.org/support/plugin/wp-mail-smtp/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/wp-mail-smtp/unresolved/) * [Reviews](https://wordpress.org/support/plugin/wp-mail-smtp/reviews/) * 3 replies * 2 participants * Last reply from: [Eric Malalel](https://wordpress.org/support/users/teachlynx/) * Last activity: [2 years, 2 months ago](https://wordpress.org/support/topic/error-500-when-activating-plugin-2/#post-17544521) * Status: resolved