Nothing. Idk, I just click continue if I were you.
But if you wanna log in to ijji without using brower, log in through Reactor, then click random links that leads to the website, its auto-log into the site and no worry bout the error. lol
Meaning your sign-in info is not encrypted when it's being sent meaning evil people could get a hold of it. If you're on a home network, don't worry about it unless you're broadcasting your network unsecured.