Downloaded 5.1.1. to my iphone. Now, Safari will not connect to my server. Can not download web pages and many of my apps. Running very slow sluggish! Is there a fix? Sound like other users are experiencing same problems. Anyone have a solution?

Try rebooting the device by pressing and holding the on/off and home buttons simultaneously until the screen goes blank and you see the apple logo. It should take about 10-15 seconds to reboot.

Basic troubleshooting steps oultlined in the User Guide are restart, reset, restore from backup, restore as new device.

You need to go through all steps in succession until your problem is solved. If going through ALL these steps fails to resolve your issue, then you'll need to bring your phone into Apple for evaluation and possible replacement.