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.NET Forum / ASP.NET / Caching / February 2005Session problems in IIS6/Windows2003
Hi, I have an ASP.NET application functioning properly on Windows 2000 server and built using Visual Studio 2003. The application saves in the Session Object DataView objects, instances of Classes, and the ViewState - as well as name=variable combinations. The SessionState is defined as InProc. We are upgrading our servers to Windows 2003 server. As I start testing the application on Windows 2003 server, I am noticing that the server is dropping certain Session objects intermittently. However, the "ASP.NET_SessionId" is consistently the same throughout one browser session. This is a single server not clustered. I have read through other postings where the recommendation is to use StateServer for the SessionState. The work involved with serializing all of the objects would be quite an effort. I am thinking the whole caching model of my application would need to be redesigned in order to fit in a new model. 1. Are there any known bugs in IIS6/Windows 2003 with Session that exhibit this behavior? 2. Assuming no bugs are reported. Because IIS was rewritten in IIS6, did the caching model change for Session to cause this problem with my application? 3. Assuming a workaround is needed, which of the caching models would you recommend? Your input is greatly appreciated. Thank you. Dave Check the number of processes for your Application Pools. If your app pools are using more than one process, you might "randomly" loose session objects. For more info: http://www.developmentnow.com/blog/2005/01/randomly-loosing-session-state-on-iis.aspx  SignatureBen Strackany www.developmentnow.com > Hi, > [quoted text clipped - 26 lines] > > Dave Ben, Thank you for getting back to me so quickly. I checked the configuration of the application pool. Under the "web garden" section of the Performance tab, it says "Maximum number of worker processes = 1". One additional item to note. I have two websites and eight virtual directories configured in this application pool. Dave > Check the number of processes for your Application Pools. If your app pools > are using more than one process, you might "randomly" loose session objects. [quoted text clipped - 39 lines] > > > > Dave Ben, I am such an idiot. I ran some tests displaying a value from the Session object. It would appear, disappear, then reappear. So the Session object was not getting reset. The behavior implied that it existed in a particular section of memory managed by a worker process. After closer examination, I found that I was looking at the properties of the wrong application pool in my initial response. The application pool configured for the website was set to 5 worker processes. This explains the behavior I saw. Depending how many times I click the refresh button, I would get a different worker process. When I hit the worker process with the Session object, it would appear. Otherwise it would the value for the Session object would not appear. Setting the worker processes to 1 resolved the problem. Obviously using a different SessionState like SQL Server or StateServer would also have resolved the problem. But I didn't want to go through and serialize all of my objects before saving them. Is there any way that this little tip can be added to online help for a future release? It's isn't documented anywhere. Thank you for your assistance. Dave > Ben, > [quoted text clipped - 50 lines] > > > > > > Dave Hi Dave, glad to hear my tip helped. As far as it being online somewhere, I think it's buried somewhere in MSDN about the Cache or Session object. Not sure if it's in IISfaq, tho. SignatureBen Strackany www.developmentnow.com > Ben, > [quoted text clipped - 39 lines] > > > > > > For more info: http://www.developmentnow.com/blog/2005/01/randomly-loosing-session-state-on-iis.aspx > > > > Hi, > > > > [quoted text clipped - 33 lines] > > > > > > > > Dave > Hi, > [quoted text clipped - 26 lines] > > Dave Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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