After an upgrade of a customer site from EPiServer 5 to EPiServer 6 all scheduled jobs stopped working in all environments. When debugging the scheduling service (in a command prompt run "EPiServer.SchedulerSvc.exe DEBUG" in the service directory) we noticed that when the service tried to connect to the site it failed with the following error message,
#INF# [_LM_W3SVC_1_ROOT] Failed calling site (Attempting to deserialize an empty stream.)
We tried to clear the "EPiServer.SchedulerService.Sites.xml" file to force a re-registration of the site but it never registered. After some thinking and contact with EPiServer support we found the fault, a missing module in Web.config. When we added the "FirstBeginRequestModule" module to the modules section everything started working again.
<configuration> <system.webServer> <modules runAllManagedModulesForAllRequests="true"> <add name="FirstBeginRequestModule" precondition="managedHandler" type="EPiServer.Web.InitializationModule, EPiServer"> </modules> </system.webServer> </configuration>
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