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.NET Forum / ASP.NET / General / September 2007Problem : Client request is processed simultaneously by two threads !
I have a problem with an ASP.NET 2.0 Application. A client request is processed in parrallel by two threads. After further analysis, it appears that : - There is 2 disctinct session for the request (Session_Start in global.asax) - One of the session ends (Session_End in global.asax). - The ramining session is used for subsequent requests, and everything works fine. - This is happening primarily when the application is started for the first time, but sometimes it is on a simple page request. No page in particular is concerned, and I can't reproduce it myself. My application generates a log file, and the facts exposed here are clearly visible in that file. The IIS log file shows that only one request is comming from the client. Take a look at the following : Line |Thread Id| Date| Hour|Delta| Category|Text ------------------------------------------------------------------------------------------ 28387| 00000007|05/09/2007|13:35:33.611| + | Hit|Session starting from [196.201.XX.XXX]...| 28388| 00000007|05/09/2007|13:35:33.611| 0| Browsers|Browser is : [IE] Version [6.0] on [WinXP]| 28393| 00000001|05/09/2007|13:35:33.611| 0| Hit|Session starting from [196.201.XX.XXX]...| 28394| 00000001|05/09/2007|13:35:33.611| 0| Browsers|Browser is : [IE] Version [6.0] on [WinXP]| 28396| 00000007|05/09/2007|13:35:33.783| 172|Client Language Preferences|Prefered Language is [fr] LCID -> 12| 28397| 00000001|05/09/2007|13:35:33.783| 0|Client Language Preferences|Prefered Language is [fr] LCID -> 12| 28398| 00000001|05/09/2007|13:35:33.798| 15| |AcquireRequestState| 28399| 00000001|05/09/2007|13:35:33.798| 0| |No Cookie with prefered language. Browser languages will be analysed (english is default) !| 28400| 00000001|05/09/2007|13:35:33.798| 0| |Selected runtime culture is [fr]| 28401| 00000001|05/09/2007|13:35:33.798| 0| || 28402| 00000007|05/09/2007|13:35:33.798| 0| |AcquireRequestState| 28406| 00000001|05/09/2007|13:35:34.533| 735| StartEndFunction|Page [/members/Web/SendFax.aspx] is requested for the first time.| 28407| 00000007|05/09/2007|13:35:34.533| 0| StartEndFunction|Page [/members/Web/SendFax.aspx] is requested for the first time.| 28408| 00000001|05/09/2007|13:35:34.564| 31| StartEndFunction|Entering InitSessionUserId()| 28409| 00000001|05/09/2007|13:35:34.564| 0| |Time zone offset (GMT) cookie value is [0]| 28410| 00000007|05/09/2007|13:35:34.564| 0| StartEndFunction|Entering InitSessionUserId()| 28411| 00000007|05/09/2007|13:35:34.564| 0| |Time zone offset (GMT) cookie value is [0]| 28412| 00000001|05/09/2007|13:35:35.189| 625| |********* TEMP : GetRoles() : User is [5422cefa09844ea99283e9710e7a5c99-xxxx.xxxxxxx@yahoo.fr] *********| 28413| 00000007|05/09/2007|13:35:35.204| 15| |********* TEMP : GetRoles() : User is [5422cefa09844ea99283e9710e7a5c99-xxxx.xxxxxxx@yahoo.fr] *********| 28414| 00000007|05/09/2007|13:35:35.251| 47| RTEFBLDAPUser|Finding existing user [xxxxx.xxxxxxxx@yahoo.fr] in []...| 28415| 00000001|05/09/2007|13:35:35.251| 0| RTEFBLDAPUser|Finding existing user [xxxxx.xxxxxxxx@yahoo.fr] in []...| 28416| 00000001|05/09/2007|13:35:35.267| 16| DirectoryHelper|DetectDirectory [LDAP://rcs.private]| 28417| 00000007|05/09/2007|13:35:35.267| 0| DirectoryHelper|DetectDirectory [LDAP://rcs.private]| 28418| 00000001|05/09/2007|13:35:35.267| 0| DirectoryHelper|Directory is detected as [ActiveDirectory]| 28419| 00000001|05/09/2007|13:35:35.267| 0| DirectoryHelper|Naming context from RootDSE is [DC=rcs,DC=private]| 28420| 00000007|05/09/2007|13:35:35.267| 0| DirectoryHelper|Directory is detected as [ActiveDirectory]| 28421| 00000007|05/09/2007|13:35:35.267| 0| DirectoryHelper|Naming context from RootDSE is [DC=rcs,DC=private]| 28422| 00000001|05/09/2007|13:35:35.267| 0| DirectoryHelper|GetDefaultContainer [LDAP://rcs.private/ou=XXXXXXXXXXXXXXX,OU=XXXXXXXXXX,DC=rcs,DC=private] with user [RCS\rw.gofaxbox] and AuthenticationTypes [Secure] | 28423| 00000007|05/09/2007|13:35:35.267| 0| DirectoryHelper|GetDefaultContainer [LDAP://rcs.private/ou=XXXXXXXXXXXXXXX,OU=XXXXXXXXXX,DC=rcs,DC=private] with user [RCS\rw.gofaxbox] and AuthenticationTypes [Secure] | 28424| 00000001|05/09/2007|13:35:35.267| 0| RTEFBLDAPUser|DirectorySearcher Filter is [(&((objectClass=user)(mail=xxxxx.xxxxxxx@yahoo.fr)))] Scope is [Subtree]| 28425| 00000007|05/09/2007|13:35:35.267| 0| RTEFBLDAPUser|DirectorySearcher Filter is [(&((objectClass=user)(mail=xxxxx.xxxxxxx@yahoo.fr)))] Scope is [Subtree]| 28427| 00000001|05/09/2007|13:35:35.314| 47| |Find all user's email...| 28428| 00000007|05/09/2007|13:35:35.314| 0| |Find all user's email...| 28429| 00000001|05/09/2007|13:35:35.329| 15| StartEndFunction|Leaving InitSessionUserId()| 28430| 00000007|05/09/2007|13:35:35.329| 0| StartEndFunction|Leaving InitSessionUserId()| 28431| 00000007|05/09/2007|13:35:35.329| 0| StartEndFunction|End PageLoad| 28432| 00000001|05/09/2007|13:35:35.329| 0| StartEndFunction|End PageLoad| 28433| 00000001|05/09/2007|13:35:36.142| 813| Application Error|An entry with the same key already exists.<?xml version="1.0" encoding="utf-8"?>[0D][0A]<RTELogClientExceptionContainer xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">[0D][0A] <Source>System</Source>[0D][0A] <StackTrace> at System.Collections.Specialized.ListDictionary.Add(Object key, Object value)[0D][0A] at System.Web.UI.ClientScriptManager.RegisterScriptBlock(ScriptKey key, String script, ListDictionary& scriptBlocks, ArrayList& scriptList, Boolean needsScriptTags, Boolean& inScriptBlock)[0D][0A] at System.Web.UI.ClientScriptManager.RegisterScriptBlock(ScriptKey key, String script, ClientAPIRegisterType type)[0D][0A] at System.Web.UI.ClientScriptManager.RegisterClientScriptInclude(Type type, String key, String url)[0D][0A] at System.Web.UI.ScriptRegistrationManager.RegisterClientScriptInclude(Control control, Type type, String key, String url)[0D][0A] at System.Web.UI.ScriptManager.RegisterClientScriptIncludeInternal(Control control, Type type, String key, String url)[0D][0A] at System.Web.UI.ScriptManager.RegisterScripts()[0D][0A] at System.Web.UI.ScriptManager.OnPagePreRenderComplete(Object sender, EventArgs e)[0D][0A] at System.EventHandler.Invoke(Object sender, EventArgs e)[0D][0A] at System.Web.UI.Page.OnPreRenderComplete(EventArgs e)[0D][0A] at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)</StackTrace>[0D][0A] <Message>An entry with the same key already exists.</Message>[0D][0A]</RTELogClientExceptionContainer>| Any help appreciated. a common cause is a src="" in the page. this will cause the browser to do a second request. if you are using firefox, check the media tab to see if the page is referenced again. if you are using IE, get the dev toolbar. -- bruce (sqlwork.com) > I have a problem with an ASP.NET 2.0 Application. > A client request is processed in parrallel by two threads. [quoted text clipped - 168 lines] > > Any help appreciated.
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