You should use the following command on linux box from blocking the ip address.
iptables -A INPUT -s 198.154.62.21 -j DROP
above commands will only work on linux boxes.
you can add the second sidebar using following URL:
I found really informative.
[link removed]
I faced similier issue. I just deleted the w3 cache then removed the cache directory from wp-content folder and reinstalled the w3 cahce plugin and configured again..That works for me perfectly.
Thread Starter
Purab
(@purab)
This link found me helpful. I deactvated all plugin but still issue not solved.
I deleted the cache from wp-content folder using following command.
rm -rf w3tc
This solved my issue.