WiFi Login issue - website based login

[goofersmack]

I live in an apartment building where only wired internet is provided, to make it wireless I plugged the Ethernet into a new Airport Express and my laptop and iPhone were able to connect wirelessly. I was able to use wi-fi, Airplay etc. Each time I connect to the wireless network a new browser window opens up and I put in my ISP id and password. I only used to log in once from one device and all my devices were connected.
But something has changed recently, noticed after I bought the iPhone 5. Now if the laptop is connected to Wifi and internet and I try to connect the iphone or ipad, the login window comes up on the device, and if I login from one of them then my laptop is kicked out.
Strangely if I dont login from the device it won't even connect to WiFi and keeps using 3G.

What could be wrong? I don't remember changing any settings. The system worked perfect till about a week ago.
I wish to have all my devices connected wirelessly to the network, with or without internet, so atleast I can use the AirPlay feature.

I have: Airport Express, iPhone 5 64GB, Macbook Pro retina 15” running Win7 with bootcamp, iPad 3

 

[imagoon]

It sounds like to me that someone may have a) put block on routers b) your airport express isn't a router and someone limited you to one device per port. You likely need to use a NAT device and then connect all your devices. I don't deal with apple often so hopefully someone will know if you airport is just an AP or is a router also.

 

[dawks]

http://www.apple.com/airportexpress/specs/

Do you have your ethernet cable plugged into the 'Ethernet WAN port' or 'Ethernet LAN port'. My guess would be the 'Ethernet LAN port'. In that case, you are bypassing the Routing/NAT feature, and the Airport Express is acting like a switch, or wireless switch (as imagoon says in b)).

What you'd want to do is plug the ethernet cable into the 'Ethernet WAN port'. Then it would be the device that is authenticated, and your devices connect to it, instead of connecting directly to the apartments network (kind of). If you have to authorize on a webpage, im not sure how this would work, unless you contact the admin and have them add the Airport Express's MAC to the allowed devices list.

And yes, the admin likely changed something recently if it was working fine. It maybe that they found your wireless router and are limiting access. Be sure you are using WPA2 with a strong password to restrict access to your network. If its open, the admin might not like that.