Recent request was denied. How to fix the issue?
It seems it is the most common problem that may appear: The most recent request was denied because it contained an invalid security token. Please refresh the page and try again.
If you are updating Joomla! from versions 3.0.0 to 3.5.1, first update Joomla! to version 3.6.0 with Joomla! Update component:
Go to Components -> Joomla! Update -> Install the update.
Next, you need to update Joomla! Update Component in Extension Manager:
If there is no updates available on the list, you need to find them:
Go to Extensions -> Manage -> Update -> Find Updates
Select Joomla! Update Component Update and press Update. Then you will be able to update Joomla!
Go to Components -> Joomla! Update -> Install the update.
Already updated Joomla! from 3.6.0 to 3.6.1 or 3.6.2 ?
Don't worry, follow steps below. All files are correct and up to date. The only thing you should do is fix database.
Go to Extensions -> Manage -> Database -> Fix
Already updated Joomla! to 3.6.1 from version earlier than 3.6.0?
Files also are up to date, but it's recommended to use Database Fix as well. Follow the same steps from the previous point.
Troubles with log-in on version 3.6.1
In some cases (it seems it is related only with PHP 5.3) you may encounter a problem with log-in: 0 Failed to start the session: already started by PHP ($_SESSION is set).
To solve the problem, you need to update Joomla! manually to 3.6.2 version with your favourite FTP client.
Just download Joomla_3.6.2-Stable-Update_Package.zip package from https://github.com/joomla/joomla-cms/releases/tag/3.6.2 , unzip and upload to server (remember to allow overwriting files).
After that you should be able to log-in. The same as mentioned above, you need use Fix Database function.
The other way of fixing this issue is modify files. More details in topic: https://github.com/joomla/joomla-cms/pull/11430
Alert in Install component
In some cases you may encounter alert in Install component: No installation plugin has been enabled. At least one must be enabled to be able to use the installer. Go to the Plugin Manager to enable the plugins.
To fix this issue you use discover extensions option:
Go to Extensions -> Manage -> Discover -> Discover button
Then install:
And enable them in Extensions -> Plugins
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