Whenever I try to access the install.aspx or installwizard.aspx, the application crashes. Here is the Stack Trace dump:

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ArgumentException: format of the initialization string does not conform to specification starting at index 0.]
   System.Data.Common.DbConnectionOptions.GetKeyValuePair(String connectionString, Int32 currentPosition, StringBuilder buffer, Boolean useOdbcRules, String& keyname, String& keyvalue) +1242
   System.Data.Common.DbConnectionOptions.ParseInternal(Hashtable parsetable, String connectionString, Boolean buildChain, Hashtable synonyms, Boolean firstKey) +128
   System.Data.Common.DbConnectionOptions..ctor(String connectionString, Hashtable synonyms, Boolean useOdbcRules) +102
   System.Data.SqlClient.SqlConnectionString..ctor(String connectionString) +52
   System.Data.SqlClient.SqlConnectionFactory.CreateConnectionOptions(String connectionString, DbConnectionOptions previous) +24
   System.Data.ProviderBase.DbConnectionFactory.GetConnectionPoolGroup(String connectionString, DbConnectionPoolGroupOptions poolOptions, DbConnectionOptions& userConnectionOptions) +125
   System.Data.SqlClient.SqlConnection.ConnectionString_Set(String value) +56
   System.Data.SqlClient.SqlConnection.set_ConnectionString(String value) +4
   System.Data.SqlClient.SqlConnection..ctor(String connectionString) +21
   DotNetNuke.Data.SqlDataProvider.ExecuteADOScript(String SQL) +28
   DotNetNuke.Data.SqlDataProvider.ExecuteScript(String Script, Boolean UseTransactions) +388
   DotNetNuke.Data.SqlDataProvider.ExecuteScript(String Script) +6
   DotNetNuke.Data.SqlDataProvider.GetProviderPath() +191
   DotNetNuke.Common.Globals.GetUpgradeStatus() +78
   DotNetNuke.Common.Initialize.CheckVersion(HttpApplication app) +147
   DotNetNuke.Common.Initialize.InitializeApp(HttpApplication app) +405
   DotNetNuke.Common.Initialize.Init(HttpApplication app) +125
   DotNetNuke.HttpModules.RequestFilter.RequestFilterModule.FilterRequest(Object sender, EventArgs e) +162
   System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +92
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +64
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Any idea what might be the probable reason?

Hi Kuntal,

I've not seen this specific error before, but the exception seems to be telling you that there is a problem with the connection strings specified in your web.config file.  What exactly are you using for this value?

Brandon