TYPO3 Core

I've followed some suggestion about clearing the temp folder, which I did to no success at resolving the problem. It also suggested I mod the php.ini file but that did not help either.

I have the same problem with typo3 4.0.1/php5

with or without curl use
with or without "Enable extensions without review"
with random mirror or selected mirror

if I remove the typo3temp/extensions.xml.gz file, it's downloaded when I retrieve/update but I have a blank page, then a lookup give me "no matching extensions were found"

I also have the same problem.
TYPO3 checked out from svn, php4:

I delete extensions.xml.gz, then click "retrive/update" and, after long wait (I have max_execution_time=90), get "The extension list has not changed remotely, it has thus not been fetched."...

putting the follwoing lines into my htacces file solved the problem for my installation (I do not have access to the configuration of the Webserver since I have only a shared webspace):

php_value memory_limit 38M
php_value max_execution_time 90

then deleted extensions.xml.gz and refetched it. Voila, it worked.

(using typo3 4.0.2 / PHP 5)

Looks like a duplicate of #15663.