I just got into exhentai.org here is how you do it:
1. Go to e-hentai.org and create an account.
2. Clear all of you internet cookies, you can use ccleaner to do this.
3. Go to g.e-hentai.org/home.php and login using your e-hentai.org username and password.
4. Go to exhentai.org, it should now show you a list of galleries like e-hentai.org does.

If you see the panda screen you've done something wrong, clear your cookies and try again.