ASP.NET: Session.SessionID changes between requests

Question

ASP.NET: Session.SessionID changes between requests

Why does the property SessionID on the Session-object in an ASP.NET-page change between requests?

I have a page like this:

...

<div>

    SessionID: <%= SessionID %>

</div>

...

And the output keeps changing every time I hit F5, independent of browser.

session asp-net

3 years ago by vishaljlf39

2 Answers

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**Amit8z4mc** · Answer 1 · 2021-08-09T12:09:58

n my case I figured out that the session cookie had a domain that included www. prefix, while I was requesting page with no www..
Adding www. to the URL immediately fixed the problem. Later I changed cookie's domain to be set to .mysite.com instead of www.mysite.com.

**sandhya6gczb** · Answer 2 · 2021-08-10T15:09:45

There is another, more insidious reason, why this may occur even when the Session object has been initialized as demonstrated by Cladudio.

In the Web.config, if there is an <httpCookies> entry that is set to requireSSL="true" but you are not actually using HTTPS: for a specific request, then the session cookie is not sent (or maybe not returned, I'm not sure which) which means that you end up with a brand new session for each request

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ASP.NET: Session.SessionID changes between requests

2 Answers

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