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You may face following error message with a form which is using CDONTS component to send email on a Plesk server :-
ERROR :-
Microsoft VBScript runtime  error ‘800a0046′
Permission denied
/support/cdonts.asp, line 15
CAUSE :-
This error occurs only when the web site user/IUSR do not have permissions over SMTP.
FIX :
1] Open Internet Information Services (IIS)
2] Under Local Computer [...]

If you have your web site added in IIS and you get error something like following while browsing it :-
Server Error in Application “application name”
HTTP Error 500.19 – Internal Server Error
HRESULT: 0×8007000d
Description of HRESULT
The requested page cannot be accessed because the related configuration data for the page is invalid.

Well this is the common error but [...]

You might have faced this error message several times with your .Net 2.0 or higher version applications.
Some times restarting IIS may fix this error as it recycles all Application Pools present on server.
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Following are some of the reasons and resolutions if restarting IIS does not fix this error :
“Application pool of the web site is [...]

RPC stands for Remote Procedure Call.
Service name : RpcSs
Description : “Serves as the endpoint mapper and COM Service Control Manager. If this service is stopped or disabled, programs using COM or Remote Procedure Call (RPC) services will not function properly.”
RPC is responsible for a application executing on one machine to access a service/process on another [...]