The Problem: I can't connect to public, unencrypted WiFi at my local public library or Peets Coffee.

My Setup: Late 2006 MacBookPro running 10.5.8. I have Parallels installed.

It's supposed to work like this: 1) Connect to their unencrypted WiFi network 2) Open a browser which redirects you to their "enter password/agree to terms" page. 3) Browse normally.

I can connect to the WiFi network, but when I try to authenticate I always get stuck in a redirect loop. It's been like this for a while. Even before I upgraded to 10.5.8.

I never have trouble with encrypted networks or regular open WiFi.

What I've tried:

• Disabling Parallels connections in Network Prefs. Superstition: somehow Parallels installed something in the network stack that's messing me up.
• Pinging the IP address of the WiFi node I'm connected to. I can ping it, it's there, but I still get stuck in this authentication redirect loop.
• Tried different browsers, tried different cookie and security settings. Even tried IE under Parallels. No dice.
• Tried flushing DNS cache.
• Asked library and coffee employees for help. It didn't go well.

My Question: Anybody else have this problem? What should I be looking for?