diff -ruNx CVS TYPO3core.anon/typo3/mod/tools/em/class.em_index.php TYPO3core/typo3/mod/tools/em/class.em_index.php
--- TYPO3core.anon/typo3/mod/tools/em/class.em_index.php	2006-03-26 20:12:24.000000000 +0200
+++ TYPO3core/typo3/mod/tools/em/class.em_index.php	2006-04-03 10:51:32.000000000 +0200
@@ -1385,7 +1385,8 @@
 				$mfile = t3lib_div::tempnam('mirrors');
 				$mirrorsFile = t3lib_div::getURL($this->MOD_SETTINGS['mirrorListURL']);
 				if($mirrorsFile===false) {
-					$content = '<p>The mirror list was not updated, it could not be fetched from '.$this->MOD_SETTINGS['mirrorListURL'].'</p>';
+					t3lib_div::unlink_tempfile($mfile);
+					$content = '<p>The mirror list was not updated, it could not be fetched from '.$this->MOD_SETTINGS['mirrorListURL'].'. Possible reasons: network problems, allow_url_fopen not allowed, curl not enabled.</p>';
 				} else {
 					t3lib_div::writeFile($mfile, $mirrorsFile);
 					$mirrors = implode(gzfile($mfile));
@@ -1411,13 +1412,13 @@
 				if(is_file(PATH_site.'typo3temp/extensions.xml.gz')) $localmd5 = md5_file(PATH_site.'typo3temp/extensions.xml.gz');
 
 				if($extmd5 === false) {
-					$content .= '<p>Error: The extension MD5 sum could not be fetched from '.$mirror.'extensions.md5</p>';
+					$content .= '<p>Error: The extension MD5 sum could not be fetched from '.$mirror.'extensions.md5. Possible reasons: network problems, allow_url_fopen not allowed, curl not enabled.</p>';
 				} elseif($extmd5 == $localmd5) {
 					$content .= '<p>The extension list has not changed remotely, it has thus not been fetched.</p>';
 				} else {
 					$extXML = t3lib_div::getURL($extfile);
 					if($extXML === false) {
-						$content .= '<p>Error: The extension list could not be fetched from '.$extfile.'</p>';
+						$content .= '<p>Error: The extension list could not be fetched from '.$extfile.'. Possible reasons: network problems, allow_url_fopen not allowed, curl not enabled.</p>';
 					} else {
 						t3lib_div::writeFile(PATH_site.'typo3temp/extensions.xml.gz', $extXML);
 						$content .= $this->xmlhandler->parseExtensionsXML(implode(gzfile(PATH_site.'typo3temp/extensions.xml.gz')));
@@ -1727,7 +1728,7 @@
 						}
 					} else $content = 'Error: The extension can only be installed in the path '.$this->typePaths[$EM_CONF['lockType']].' (lockType='.$EM_CONF['lockType'].')';
 				} else $content = 'Error: No extension key!!! Why? - nobody knows... (Or no files in the file-array...)';
-			}  else $content = 'Error: The datatransfer did not succeed, '.$fetchData;
+			}  else $content = 'Error: The datatransfer did not succeed. '.$fetchData;
 		}  else $content = 'Error: Installation is not allowed in this path ('.$this->typePaths[$loc].')';
 
 		$this->content.=$this->doc->section('Extension import results',$content,0,1);
diff -ruNx CVS TYPO3core.anon/typo3/mod/tools/em/class.em_terconnection.php TYPO3core/typo3/mod/tools/em/class.em_terconnection.php
--- TYPO3core.anon/typo3/mod/tools/em/class.em_terconnection.php	2006-03-25 14:40:11.000000000 +0100
+++ TYPO3core/typo3/mod/tools/em/class.em_terconnection.php	2006-04-03 10:45:46.000000000 +0200
@@ -61,6 +61,8 @@
 		$t3x = t3lib_div::getURL($mirrorURL);
 		$MD5 = md5($t3x);
 
+		if($t3x===false) return 'The T3X file could not be fetched. Possible reasons: network problems, allow_url_fopen not allowed, curl not enabled.';
+
 		if($MD5 == $expectedMD5) {
 				// Fetch and return:
 			return $this->decodeExchangeData($t3x);