Location services in mobile Safari: Don't Allow is saved...forever? Even with reset

I got it after about giving up and thinking there wasn't a solution. I managed to share my location on my iPhone 4s by doing the following:

Go to Settings -> General, scroll to the bottom and go to Reset-> Reset Location & Privacy.

The next time I opened my web-app to test its user location features, it worked like a charm. Hope this helps for all who have this problem.

The following steps solved it for me:

1. Close all tabs in safari with the domain in question open.
2. Close Safari (Hold home button and cross off).
3. Settings -> General -> Reset -> Reset Location Warnings / Reset Location & Privacy.
4. Open Safari and try again.

The trick (compared to mark's answer) is to make sure you close Safari fully. When I followed mark's answer, I got the prompt re-appearing for Safari itself, but not for my domain. After closing Safari then following mark's answer, I got 2 successive prompts, firstly for Safari, and then for my domain.

I was having the same issue caused by repeatedly hitting the "Do not allow" option.

The way I fixed this in my iPad 2 was to go into "Settings > General > Restrictions", then enable restrictions (have to enter passcode). From there I went into "Location" under the "Allow Changes" section and checked "Allow Changes" and made sure location services were on for all the listed apps. This seems to have reset it for me. After that I could go back into "General > Restriction" and disable restrictions again.

Hope this helps you!