Error 403 access denied while connecting to site after a successful migration using forms based authentication
When trying to connect to a site that has already had a successful migration you may see a 403 error or message that states the cookie is invalid and just hangs.
This is caused by how the Forms Based Authentication is caching the cookie value. If there is a comma in the cookie string we convert it to %2c. Sometimes on a cookie refresh the comma was not being converted which caused an invalid cookie.
There is a hotifx build for 6.6.1 and 6.7. If you are experiencing a similar issue, please contact support to verify this is the same issue and obtain the hotfix build.