Plugin settings like Spam Protector can be saved, but those from like the Recaptha and Spamblock (Bayes) cannot.The webpage at http://.../serendipity_admin.php? might be temporarily down or it may have moved permanently to a new web address.
Error 324 (net::ERR_EMPTY_RESPONSE): Unknown error.
As far as I am aware I did not change any file permissons.
The upload and upgrade to 1.5.2 was without errors.
Verify Installation Integrity: All required files verified
-> Serendipity 1.5.2 en PHP 4.4.8-0.dotdeb.0