Magento 2 error

[Countrymun]

Hi everyone

We recently upgraded to magento 2.4

Things working reasonably well for past couple of weeks - although backend is extremely slow compared to our M1 installation.
However, when trying to place an order on hold today, I got a page of error information which began with:

1 Exception #0 (Magento\Framework\Exception\SessionException): The "remote_addr" session value is invalid. Verify and try again.
<pre>#1 Magento\Framework\Session\Validator->validate(&Magento\Backend\Model\Auth\Session\Interceptor#0000000021d463690000000063788c36#) called at [vendor/magento/framework/Session/SessionManager.php:211]
#2 Magento\Framework\Session\SessionManager->start() called at [generated/code/Magento/Backend/Model/Auth/Session/Interceptor.php:167]
#3 Magento\Backend\Model\Auth\Session\Interceptor->start() called at [vendor/magento/framework/Session/SessionManager.php:141]
********************************************************************************

Not sure if that's enough detail from the error page but the other thing I noticed is that the usual favicon on browser bar was replaced by generic internet globe icon.

Is anyone able to let me know if this could be an error on my old computer/internet or something that developer needs to sort?
thank you!

 

[Rob-Ed]

I usually find this sort of error can be resolved by reversing the last action performed in the backend. If I find an action that results in an exception I tend to avoid using it where possible, it's much cheaper than getting a dev involved. Maybe try using a different status, pending/cancelled etc, it's only a 'label' - unless you've set up custom actions based on the status...

 

[Countrymun]

Thank you for your help - much appreciated.
In fact, I have just found that if I use HOLD from the action menu on the main order page, it works okay. It only creates the error if I try to use HOLD on the individual order page for some reason so hopefully I can just use the first menu in future. (just explaining in case anyone else has the same issue.).
Thanks again!