StoneChopper

Many thanks, Cgw!

Hi Shane
Thank you very much for the post. I will check the code.

Hi, itpixie
Thank you so much for all the useful information. To be honest, I suspect GoDaddy.

Hi,itpixie
Thanks for the reply.
Your questions are Ok.
After blocking the IP, it just disappears, not coming back.
I have checked ‘allow anyone to register’ and systemwpadmin is not a WP user. My site was hacked once.
Thanks for the suggestion. I may give it a try.

Hi, Drew Jaynes
Thank you so much for the informative reply.
Yes, I backed up one and kept the other one in the root folder. I compared the two, only find out the secret keys are different. So I updated the key.
I will read your suggested article. I ‘ve learned a lot recently from people like you.
Thanks again.

Hi, AndyImages
Thank you very much for your reply. That is what I am thinking an doing, but very confused of the other one.