On intranet/internal WordPress installations it might be required to block external requests, including the plugin feature to check for updates.
To do that, use either the WP_HTTP_BLOCK_EXTERNAL constant in your wp-config.php file, that blocks all external requests globally on the whole WordPress installation:
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define( 'WP_HTTP_BLOCK_EXTERNAL', true );
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..or, if you wish blocking requests only from Ajax Search Pro, then use the ASP_BLOCK_EXTERNAL constant: