Hi,
I have no issue using both firefox and chrome on fedora and on ios.
few days ago we had a lot of users /ip banned because of a change of configuration between the webservers. This has been solved. Check again. The message displayed to user is the same.
Also we have moved to the color of koozali, but still are using the contribs.org url for a few weeks. If you try to log from forums.koozali.org SMF will redirect you to forums.contribs.org during the login process and will display this kind of error if your are not already logged in.
If you store your password in chrome, check it is up to date, i have seen itmixed once or two. This could be another issue.