I wanted to share a recent experience I myself had with not being able to log into the chat, and if I'm the owner and I can't, you know it can happen to anyone. For 4 whole days I was not able to, the situation resolved itself. I am still not 100% sure this theory is correct, but I spoke to the web host, my internet service provider and my computer guy.
In all liklihood it was a DNS issue by my internet service provider. They did something on their end, as I tried from 2 different computers in my home and was not able to log in and everyone else could. I could access the site, but not the chat. Yes, it was frustrating, but thankfully this DNS thing does resolve itself in a few days. There was nothing I could do but wait. I tried all the things my web host and computer guy told me to try with no luck. Sometimes things are beyond our control and time is the only thing.