Strange Steam / Browser issue

Same issue here. Seems to be related to proxy or the network I'm connected to. Can't login from work, but I can login when connected to home network.

I have been experiencing this for the past few days. It creeps up almost once a day.

When I try to log-in, sometimes my profile appears at the top right corner of the screen, along with the login page. When I manage to get that, I log out from Steam from the menu under my user name. Once I've done that, I'm able to log back in until the issue pops up again the next day.

Same happen to me but with some sites who need to join trough steam id (i cant login at all). Loging into steam community from browser, for me, work normaly. Im using Mozilla Firefox.

Have you tried to flush the dns? This fixes some browser issues.

Had this problem on my phone. Laptop and client works fine so far.

Wow - this is crazy... so last night, somehow my Desktop worked fine with logging into steam on the browser, now today back at work -it won't login! WTF!

opened a ticket moments ago , I'm having the same problem since this morning (10 hours passed already)
I still can't login in my account from any browser, but steam desktop client is working fine.
Created new user profiles for chrome and firefox (better than simply delete cache/cookies), disabled any AV/firewall software, nothing seems to help.
I can get to the steamguard popup and the code it's accepted , but after that I found myself not logged in.
I also tried on a different pc of my home lan, same story, and even on my android chrome browser I'm getting the same problem.
All the devices share the same internet connection, I can't reboot my router at the moment, maybe that could help. I'll try later.

well it seems messing around my router and connections solved the problem
I don't know what I've done exactly but I switched to a different internet connection just for a couple minutes and now I'm back to my own provider, even without rebooting anything or change my public ip solved the problem. Going to close the ticket after testing in my other home devices.

Same.

Ok - this is driving me nuts!! All of a sudden it starts working at home, then doesn't work at work. Next day - Work is fine, home won't work! WTF is going on?1?!?

Did you ever solve this? It sounds like we're having the same problems http://www.steamgifts.com/discussion/zRnT6/steam-login-problems

it's because you are a llama.

Yes, annoyed bug.
Sometimes it happens only in Opera 12 browser.
One day it was in almost all browsers (IE 11, Opera 12, Slimjet, Vivaldi), and even on tablet with Silk browser.

Had this for a week. Couldn't access any community or store related things. They didn't let me log in.
I seem to have fixed it though, I didn't delete any history or cookies.
I just restarted my computer and switched off and on the wifi. It worked, even though my phone had the issue, I could log in with my phone and computer.
Hopefully this helps.