I see a "connection reset" error message after updating

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This may occur rarely on Windows servers, and can be solved by increasing the thread stack size by adding the following code to httpd.conf:

<IfModule mpm_winnt_module>
   ThreadStackSize 8388608
</IfModule>

If your site is on a Windows server and you do not have access to the httpd.conf file, you will need to contact your hosting company for the change to be made.

In at least one case on a local WAMP installation, the ThreadStackSize had to be set to 16777216 (16 MB) instead. This may depend on which Windows version you are using, the active Apache modules, or other settings.

On local installations, httpd.conf file is typically located at a path like: c:\wamp\bin\apache\Apache2.x.x\conf\httpd.conf


References:
https://bugs.php.net/bug.php?id=47689
https://www.drupal.org/node/1597820


Thanks to our premium customer Rodolf for helping narrow down this issue.