Can't login on server but can login locally

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Hello,

I've currently got a C5 install set up locally that is also set up and a live server. They both use the same database. When running the site locally I can login with my credentials and I can access the dashboard etc. However when I try to login on the live server I get an error saying "Invalid username or password.". I've done a password reset through the live website which worked and I managed to login on the live server. When I've logged out and come back a few days later I'm getting the same problem again.

I've set up about 8 different C5 sites in this config with Git and I've never had any issues like this.

Any help would be greatly appreciated.

extremecreations