Hello,
I have an Exchange 2019 CU14 and it was working fine till I installed the Security Update for Exchange 2019 Cumulative Update 14 (KB5036401).
since then my Event viewer is filled with ASP.NET 4.0.30319.0 Event ID 1309. ECP and OWA are working fine
Event code: 3005
Event message: An unhandled exception has occurred.
Event time: 3/5/2025 6:28:06 PM
Event time (UTC): 3/5/2025 4:28:06 PM
Event ID: 4ec8677e5ebc451d9237cb12da82d41b
Event sequence: 31608
Event occurrence: 694
Event detail code: 0
Application information:
Application domain: /LM/W3SVC/2/ROOT/owa-2-133850245435189009
Trust level: Full
Application Virtual Path: /owa
Application Path: C:\Program Files\Microsoft\Exchange Server\V15\ClientAccess\owa\
Machine name: ServerName
Process information:
Process ID: 1376
Process name: w3wp.exe
Account name: NT AUTHORITY\SYSTEM
Exception information:
Exception type: NullReferenceException
Exception message: Object reference not set to an instance of an object.
at Microsoft.Exchange.Clients.Owa2.Server.Core.OwaModule.ShouldBlockIncomingRequest(HttpContext httpContext)
at Microsoft.Exchange.Clients.Owa2.Server.Core.OwaModule.OnAuthenticateRequest(Object sender, EventArgs e)
at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
Request information:
Request URL: https://domain:444/owa/prem/15.2.1544.9/ext/def/a216ceed-7791-4635-a752-5a4ac0a5eb93/images/app_icon.png
Request path: /owa/prem/15.2.1544.9/ext/def/a216ceed-7791-4635-a752-5a4ac0a5eb93/images/app_icon.png
User host address: 192.168.3.17
User:
Is authenticated: False
Authentication Type:
Thread account name: NT AUTHORITY\SYSTEM
Thread information:
Thread ID: 50
Thread account name: NT AUTHORITY\SYSTEM
Is impersonating: False
Stack trace: at Microsoft.Exchange.Clients.Owa2.Server.Core.OwaModule.ShouldBlockIncomingRequest(HttpContext httpContext)
at Microsoft.Exchange.Clients.Owa2.Server.Core.OwaModule.OnAuthenticateRequest(Object sender, EventArgs e)
at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)