Solved

Cold Fusion Session Swapping

Posted on 2002-07-01
4
471 Views
Last Modified: 2013-12-24

I'm runnning into an interesting problem with CF session variables getting swapped by (I think) the server. If two users come in from the same IP (behind a firewall or NAT or whatever) within a minute of each other, they occasionally get the other person's session ID. Macromedia has a page on their site that gives a solution to this problem -- their solution being check and make sure the IP's are different.

Obviously, this doesn't work in this case, since we know the IP's are supposed to be the same.

Has anyone had any similar problems and found a way around them? Or can you point me to a site with more information on this topic than the Macromedia site? Thanks! :-)

Jaxman
0
Comment
Question by:jaxman
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
4 Comments
 
LVL 5

Expert Comment

by:Yog
ID: 7122773
are you using CFLOCK when setting and reading session variables, http://www.sys-con.com/coldfusion/article.cfm?id=135
0
 

Author Comment

by:jaxman
ID: 7123242
I'm going through and doing a thorough check on all the code, but I believe everything is locked down appropriately.

We've got a situation where we're using session.datasource to hold our DSN, and then at the top of application.cfm we're assigning it to request.appDSN so we can work with it in the request scope ever after instead of the session scope (to make locking easier to deal with).

Question: Will reading from a session variable (ie: putting session.datasource as an r-value of an operation) potentially cause corruption if not properly locked, or is it only when the session variables are l-values?


Jax
0
 
LVL 5

Accepted Solution

by:
Yog earned 200 total points
ID: 7123284
Jax,

yeah locking may require if you are not making a copy of it and using even for a Request scope. If you turn on (from CF Administrator) stricter checking it will tell you wheather the code is not behaving well or behaving well.

if you are using the Request scope, make sure you use the duplicate if you are making another copy of it and using, an "=" usage may just make a reference and wont help

eg.

<CFLOCK SCOPE="Application" TIMEOUT="10">
<CFSCRIPT>
  Request.Application = StructNew();
  Request.Application = Duplicate(Application);
</CFSCRIPT>
</CFLOCK>

<CFLOCK SCOPE="Session" TIMEOUT="10">
<CFSCRIPT>
  Request.Session = StructNew();
  Request.Session = Duplicate(Session);
</CFSCRIPT>
</CFLOCK>

This was suggested to me by pikala and it works good.

Yog
0
 

Author Comment

by:jaxman
ID: 7123302
I'll have to give that a try...you've given me some good pointers, its going to take a while to test them out (these non-deterministic problems are crazy to track down). Thanks for the info! :-)

Jax
0

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Most ColdFusion developers get confused between the CFSet, Duplicate, and Structcopy methods of copying a Structure, especially which one to use when. This Article will explain the differences in the approaches with examples; therefore, after readin…
When it comes to showing a 404 error page to your visitors, you do not want that generic page to show, and you especially do not want your hosting provider’s ad error page to show either. In this article, I will show you how to enable the custom 40…
With Secure Portal Encryption, the recipient is sent a link to their email address directing them to the email laundry delivery page. From there, the recipient will be required to enter a user name and password to enter the page. Once the recipient …
The Email Laundry PDF encryption service allows companies to send confidential encrypted  emails to anybody. The PDF document can also contain attachments that are embedded in the encrypted PDF. The password is randomly generated by The Email Laundr…

737 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question