Check for update -- 2.1.0 is up to date ? (no replies)

Hi, I still haven't fixed the problem of my previous post , so it may be
because of this, but anyway, when I "checked for unpdates" piwik says it is up to date, and then I get the following error

. Please report the message (Piwik 2.1.0) and full backtrace in the Piwik forums (please do a Search first as it might have been reported already!).

Warning: file_get_contents(): php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution in /usr/local/apache2/htdocs/pinguik/core/Http.php on line 406

Backtrace -->

#0 Piwik\Error::errorHandler(...) called at [:]
#1 file_get_contents(...) called at [/usr/local/apache2/htdocs/pinguik/core/Http.php:406]
#2 Piwik\Http::sendHttpRequestBy(...) called at [/usr/local/apache2/htdocs/pinguik/core/Http.php:94]
#3 Piwik\Http::sendHttpRequest(...) called at [/usr/local/apache2/htdocs/pinguik/core/UpdateCheck.php:72]
#4 Piwik\UpdateCheck::check(...) called at [/usr/local/apache2/htdocs/pinguik/plugins/CoreHome/Controller.php:175]
#5 Piwik\Plugins\CoreHome\Controller->checkForUpdates(...) called at [:]
#6 call_user_func_array(...) called at [/usr/local/apache2/htdocs/pinguik/core/FrontController.php:521]
#7 Piwik\FrontController->doDispatch(...) called at [/usr/local/apache2/htdocs/pinguik/core/FrontController.php:84]
#8 Piwik\FrontController->dispatch(...) called at [/usr/local/apache2/htdocs/pinguik/core/dispatch.php:30]
#9 require_once(...) called at [/usr/local/apache2/htdocs/pinguik/index.php:47]


There is an error. Please report the message (Piwik 2.1.0) and full backtrace in the Piwik forums (please do a Search first as it might have been reported already!).

Warning: file_get_contents(http://api.piwik.org/1.0/getLatestVersion/?piwik_version=2.1.0&php_version=5.4.10&url=http%3A%2F%2F192.168.1.5%2Fpinguik%2Findex.php&trigger=CoreHome&timezone=Europe%2FParis): failed to open stream: php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution in /usr/local/apache2/htdocs/pinguik/core/Http.php on line 406

Backtrace -->

#0 Piwik\Error::errorHandler(...) called at [:]
#1 file_get_contents(...) called at [/usr/local/apache2/htdocs/pinguik/core/Http.php:406]
#2 Piwik\Http::sendHttpRequestBy(...) called at [/usr/local/apache2/htdocs/pinguik/core/Http.php:94]
#3 Piwik\Http::sendHttpRequest(...) called at [/usr/local/apache2/htdocs/pinguik/core/UpdateCheck.php:72]
#4 Piwik\UpdateCheck::check(...) called at [/usr/local/apache2/htdocs/pinguik/plugins/CoreHome/Controller.php:175]
#5 Piwik\Plugins\CoreHome\Controller->checkForUpdates(...) called at [:]
#6 call_user_func_array(...) called at [/usr/local/apache2/htdocs/pinguik/core/FrontController.php:521]
#7 Piwik\FrontController->doDispatch(...) called at [/usr/local/apache2/htdocs/pinguik/core/FrontController.php:84]
#8 Piwik\FrontController->dispatch(...) called at [/usr/local/apache2/htdocs/pinguik/core/dispatch.php:30]
#9 require_once(...) called at [/usr/local/apache2/htdocs/pinguik/index.php:47]


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