Wi-Fi network directs to a page reading 'Success' but then proceeds to say the network isn't connected to the internet
I'm on iOS 8.3, and trying to log into my work Wi-Fi network which has historically given me problems, but this one is new. Normally, when connecting to it, I'm prompted for a username and password before being able to connect, which usually works. However, now when i try to connect, I'm directed to a page that first reads captive.apple.com, then it opens a page reading only 'Success', with only an option to select 'Cancel' at the top. Upon doing so, my phone tells me that the Wi-Fi network isn't connected to the internet (doesn't sound like Success to me, eh?) and I can either use the network without the internet or select another network from there. I've tried a lot, but if anyone else has any new ideas, I'd really appreciate it. Thanks!
iPhone 5, iOS 8.3