Need help with an ASP.Net 4.0.30319 unhandled exception error occurring on my SCCM Primary Site Server with Event Code 3005 and an Application Log Event ID 1309

When I log on to my Primary Site Server and I attempt to access this site, "http://<mysiteserverfqdn>:8530/ClientWebService/client.asmx", I receive this error:

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Server Error in '/ClientWebService' Application.

Request format is unrecognized.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidOperationException: Request format is unrecognized.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[InvalidOperationException: Request format is unrecognized.]

System.Web.Services.Protocols.WebServiceHandlerFactory.CoreGetHandler(Type type, HttpContext context, HttpRequest request, HttpResponse response) +668507

System.Web.Services.Protocols.WebServiceHandlerFactory.GetHandler(HttpContext context, String verb, String url, String filePath) +306

System.Web.Script.Services.ScriptHandlerFactory.GetHandler(HttpContext context, String requestType, String url, String pathTranslated) +89

System.Web.MaterializeHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +516

System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +288

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.34212

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When I logon to a client system and I access this site, "http://<mysiteserverfqdn>:8530/ClientWebService/client.asmx", I receive the following error:

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Server Error in '/ClientWebService' Application.

Runtime Error

Description: An application error occurred on the server. The current custom error settings for this application prevent the details of the application error from being viewed remotely (for security reasons). It could, however, be viewed by browsers running on the local server machine.

Details: To enable the details of this specific error message to be viewable on remote machines, please create a <customErrors> tag within a "web.config" configuration file located in the root directory of the current web application. This <customErrors> tag should then have its "mode" attribute set to "Off".

<system.web>

</system.web>

</configuration>

Notes: The current error page you are seeing can be replaced by a custom error page by modifying the "defaultRedirect" attribute of the application's <customErrors> configuration tag to point to a custom error page URL.

<system.web>

</system.web>

</configuration>

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In the Application Log on my Site Server, I see the following Warning message:

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Log Name: Application
Source: ASP.NET 4.0.30319.0
Date: 2/17/2015 3:16:36 AM
Event ID: 1309
Task Category: Web Event
Level: Warning
Keywords: Classic
User: N/A
Computer: <mysiteserverfqdn>
Description:
Event code: 3005
Event message: An unhandled exception has occurred.
Event time: 2/17/2015 3:16:36 AM
Event time (UTC): 2/17/2015 11:16:36 AM
Event ID: 77e16f289add4ab29f7295d0456ca47d
Event sequence: 523
Event occurrence: 2
Event detail code: 0

Application information:
Application domain: /LM/W3SVC/1091506533/ROOT/ClientWebService-4-130686111724988541
Trust level: Full
Application Virtual Path: /ClientWebService
Application Path: C:\Program Files\Update Services\WebServices\ClientWebService\
Machine name: <mysiteservercomputername>

Process information:
Process ID: 2788
Process name: w3wp.exe
Account name: NT AUTHORITY\NETWORK SERVICE

Exception information:
Exception type: InvalidOperationException
Exception message: Request format is unrecognized.
at System.Web.Services.Protocols.WebServiceHandlerFactory.CoreGetHandler(Type type, HttpContext context, HttpRequest request, HttpResponse response)
at System.Web.Services.Protocols.WebServiceHandlerFactory.GetHandler(HttpContext context, String verb, String url, String filePath)
at System.Web.Script.Services.ScriptHandlerFactory.GetHandler(HttpContext context, String requestType, String url, String pathTranslated)
at System.Web.HttpApplication.MaterializeHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Request information:
Request URL: http://<mysiteserverfqdn>:8530/ClientWebService/client.asmx
Request path: /ClientWebService/client.asmx
User host address: <SCCMClientHostIPaddress>
User:
Is authenticated: False
Authentication Type:
Thread account name: NT AUTHORITY\NETWORK SERVICE

Thread information:
Thread ID: 88
Thread account name: NT AUTHORITY\NETWORK SERVICE
Is impersonating: False
Stack trace: at System.Web.Services.Protocols.WebServiceHandlerFactory.CoreGetHandler(Type type, HttpContext context, HttpRequest request, HttpResponse response)
at System.Web.Services.Protocols.WebServiceHandlerFactory.GetHandler(HttpContext context, String verb, String url, String filePath)
at System.Web.Script.Services.ScriptHandlerFactory.GetHandler(HttpContext context, String requestType, String url, String pathTranslated)
at System.Web.HttpApplication.MaterializeHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Custom event details:

Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="ASP.NET 4.0.30319.0" />
<EventID Qualifiers="32768">1309</EventID>
<Level>3</Level>
<Task>3</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2015-02-17T11:16:36.000000000Z" />
<EventRecordID>45606</EventRecordID>
<Channel>Application</Channel>
<Computer><mysiteserverfqdn></Computer>
<Security />
</System>
<EventData>
<Data>3005</Data>
<Data>An unhandled exception has occurred.</Data>
<Data>2/17/2015 3:16:36 AM</Data>
<Data>2/17/2015 11:16:36 AM</Data>
<Data>77e16f289add4ab29f7295d0456ca47d</Data>
<Data>523</Data>
<Data>2</Data>
<Data>0</Data>
<Data>/LM/W3SVC/1091506533/ROOT/ClientWebService-4-130686111724988541</Data>
<Data>Full</Data>
<Data>/ClientWebService</Data>
<Data>C:\Program Files\Update Services\WebServices\ClientWebService\</Data>
<Data><mysiteservercomputername></Data>
<Data>
</Data>
<Data>2788</Data>
<Data>w3wp.exe</Data>
<Data>NT AUTHORITY\NETWORK SERVICE</Data>
<Data>InvalidOperationException</Data>
<Data>Request format is unrecognized.
at System.Web.Services.Protocols.WebServiceHandlerFactory.CoreGetHandler(Type type, HttpContext context, HttpRequest request, HttpResponse response)
at System.Web.Services.Protocols.WebServiceHandlerFactory.GetHandler(HttpContext context, String verb, String url, String filePath)
at System.Web.Script.Services.ScriptHandlerFactory.GetHandler(HttpContext context, String requestType, String url, String pathTranslated)
at System.Web.HttpApplication.MaterializeHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

</Data>
<Data>http://<mysiteserverfqdn>:8530/ClientWebService/client.asmx</Data>
<Data>/ClientWebService/client.asmx</Data>
<Data><SCCMClientHostIPaddress></Data>
<Data>
</Data>
<Data>False</Data>
<Data>
</Data>
<Data>NT AUTHORITY\NETWORK SERVICE</Data>
<Data>88</Data>
<Data>NT AUTHORITY\NETWORK SERVICE</Data>
<Data>False</Data>
<Data> at System.Web.Services.Protocols.WebServiceHandlerFactory.CoreGetHandler(Type type, HttpContext context, HttpRequest request, HttpResponse response)
at System.Web.Services.Protocols.WebServiceHandlerFactory.GetHandler(HttpContext context, String verb, String url, String filePath)
at System.Web.Script.Services.ScriptHandlerFactory.GetHandler(HttpContext context, String requestType, String url, String pathTranslated)
at System.Web.HttpApplication.MaterializeHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
</Data>
</EventData>
</Event>

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I am also consistently seeing the following errors in the Application Log as well on my Site Server:

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Log Name: Application
Source: ESENT
Date: 2/16/2015 5:45:40 PM
Event ID: 490
Task Category: General
Level: Error
Keywords: Classic
User: N/A
Computer: <MySiteServerFQDN>
Description:
sqlservr (1556) An attempt to open the file "C:\Windows\system32\LogFiles\Sum\Api.chk" for read / write access failed with system error 5 (0x00000005): "Access is denied. ". The open file operation will fail with error -1032 (0xfffffbf8).
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="ESENT" />
<EventID Qualifiers="0">490</EventID>
<Level>2</Level>
<Task>1</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2015-02-17T01:45:40.000000000Z" />
<EventRecordID>45517</EventRecordID>
<Channel>Application</Channel>
<Computer><MySiteServerFQDN></Computer>
<Security />
</System>
<EventData>
<Data>sqlservr</Data>
<Data>1556</Data>
<Data>
</Data>
<Data>C:\Windows\system32\LogFiles\Sum\Api.chk</Data>
<Data>-1032 (0xfffffbf8)</Data>
<Data>5 (0x00000005)</Data>
<Data>Access is denied. </Data>
</EventData>
</Event>

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Log Name: Application
Source: ESENT
Date: 2/16/2015 5:45:59 PM
Event ID: 455
Task Category: Logging/Recovery
Level: Error
Keywords: Classic
User: N/A
Computer: <MySiteServerFQDN>
Description:
sqlservr (1556) Error -1032 (0xfffffbf8) occurred while opening logfile C:\Windows\system32\LogFiles\Sum\Api.log.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="ESENT" />
<EventID Qualifiers="0">455</EventID>
<Level>2</Level>
<Task>3</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2015-02-17T01:45:59.000000000Z" />
<EventRecordID>45524</EventRecordID>
<Channel>Application</Channel>
<Computer><MySiteServerFQDN></Computer>
<Security />
</System>
<EventData>
<Data>sqlservr</Data>
<Data>1556</Data>
<Data>
</Data>
<Data>C:\Windows\system32\LogFiles\Sum\Api.log</Data>
<Data>-1032 (0xfffffbf8)</Data>
</EventData>
</Event>

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I would greatly appreciate any help here, please.

Thank you