links

docs.it4i/get-started-with-it4innovations/accessing-the-clusters/graphical-user-interface/x-window-system.md

@@ -42,7 +42,7 @@ In order to display graphical user interface GUI of various software tools, you
 X Server on OS X
 ----------------
 
-Mac OS users need to install [XQuartz server](http://xquartz.macosforge.org/landing/).
+Mac OS users need to install [XQuartz server](http://xquartz.org).
 
 X Server on Windows
 -------------------

docs.it4i/get-started-with-it4innovations/obtaining-login-credentials/obtaining-login-credentials.md

@@ -137,7 +137,7 @@ Alternative Way to Personal Certificate
 
 Follow these steps **only** if you can not obtain your certificate in a standard way. In case you choose this procedure, please attach a **scan of photo ID** (personal ID or passport or drivers license) when applying for [login credentials](obtaining-login-credentials/#the-login-credentials).
 
-1.  Go to [CAcert](https://www.cacert.org/).
+1.  Go to [CAcert](www.cacert.org).
     -   If there's a security warning, just acknowledge it.
 2.  Click *Join*.
 3.  Fill in the form and submit it by the *Next* button.