diff --git a/install/includes/config_default.php b/install/includes/config_default.php
index <HASH>..<HASH> 100644
--- a/install/includes/config_default.php
+++ b/install/includes/config_default.php
@@ -20,6 +20,7 @@
             'version' => VERSION,
             'cookie_prefix' => 'sym-',
             'session_gc_divisor' => '10',
+            'session_strict_domain' => 'yes',
             'cell_truncation_length' => '75',
             'enable_xsrf' => 'yes',
             'error_reporting_all' => 'no',
Enable session strict domain on new install

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Picked from efa6ab<I>f7
Picked from fe1a2c0fe4