How to share sessions between PHP and ASP.net application?

My company took some old php application over. Due to our preference to ASP.net and to the lack of any documentation from the previous developer, we do not want to spend much resources on developing in PHP.
For implementing new features, we will create an Asp.net application that has the same look to the user. We want to develop a kind of ‘coexisting’ web application. Therefore we must share sessions between an PHP and an Asp.net webapplication project, because there is a usermanagement involved with an existing MySQL database.

Child actions are not allowed to perform redirect actions, after setting the site on HTTPS

I am getting the error below: Child actions are not allowed to perform redirect actions. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.InvalidOperationException: Child actions are not allowed to … Read more