EDIT: I found that setting the LOCALHOST user seems to fix this problem. Using ANYHOST for some reason does not work for local logins.
I have the same problem after changing my password on my test server. I can no longer connect to new users. I was messing around, but I think this might have something to do with adding blowfish security or something.
My PHP scripts also cannot connect. I also canโt give all new privileges to new users. I'm not sure what I did to make this happen. I have outdated users who can achieve this.
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