Invalid form key. Magento 2

[TTS LTD]

When we add a configurable product and assign more then ten attributes from a attribute set for example colour and size, we then hit save it returns "Invalid form key. Please refresh the page". Is this a bug within Magento or a set up issue on our end... Any ideas?

[OST Agency · Accepted solution]

Please ask hosting provider to increase php_value max_input_vars 75000.

1. Remove app/code/local/Mage/Core/Model/Session.php is exist.
2. Try to clear the cache from var/cache directory.
3. Then clear browser cache. Especially clear or delete cookies.

Hope this helps you!

Regards

Manish

[TTS LTD]

Hi Guys,

Thank you for the comment as I increased the max_input_vars as you suggested and It resolved the problem. Again many thanks for the assistance with this.

Kind Reggards

Jez

[ashwani_mobi]

This solution doesn't work

[MayankZalavadia]

Open your server's php.ini file with root user, search for `max_input_vars` and set its value as `100000` and it will solve your problem.

max_input_vars = 100000

[Dirkey]

Sorry, but this could not be a solution. This looks more like an workaround. Increasing the size of the parameter if this error occured results in a very unsecure (DOS) server configuration. It looks more like a misconception in the implementation or an bug.

[treii28]

100000???? The default is 1000. So you're saying magento needs 100x more than the vast majority of other php programs in existence?!?!

[SanjayChauhanSB]

In root directory php.ini

add line

-----------------------------------------------
max_input_vars=10000

-----------------------------------------------

This is will solve your issue.

[BartZ]

If anyone had this issue on localhost.

Issue can be solved by changing domain url from localhost to 127.0.0.1

Can be changed in database in core_config_data

set  web/unsecure/base_url  to http://127.0.0.1

After this clear cache and its works.

I had this issue when login to backend and when adding to basket.

[dhananjayharel]

Still not working.

And this issue occurs only on chrome browser.