Question

This is in reference to the solution posted here:

The URL-encoded form data is not valid Solution

I have added this line in my web.config in appSettings section:

<add key="aspnet:MaxHttpCollectionKeys" value="3000" />

But the issue persists. Please help. Interestingly, this issue is not reproducing on my local host but on the production server, it is occuring.

Answer 1

The possible problems in your case.

1. You do not UrlEncode every value on your keys.
2. Some keys contains invalid URL characters.

check this two on your secret url string to locate the issue.