I am currently working on an existing project in ASP.NET MVC and I am running into a bizarre issue.

I have a client computer that only modifies a cookie one time. The first time (after clearing cookies in browser) the cookie is accurately updated.

After this the cookie will not update anymore.

Yet, on my computer running localhost, and on my separate client computer with the exact same code i cannot reproduce the issue. It consistently updates the cookie.

It is the exact same codebase and database. There really is no difference.

My client also mentions it “randomly” stopped working.

Are there any security settings in Chrome/IIS that could have been modified on my clients server to lead to this bizarre behaviour?

I am stumped.