c# - Microsoft.Web.Administration FlushUrl method returns 0x080070032 -

i've been wrapping head around last few days, fail come solution.

i want purge arr cache server. however, when execute fails comexception: request not supported. exception hresult: 0x80070032. when don't run in admin mode, -as expected- error: acces_denied.

i have following code:

private const string diskcachesection = "system.webserver/diskcache"; private const string flushurlmethod = "flushurl"; private const string urlmethodattribute = "url"; private const string errorcodestring = "errorcode";      public flushurlresponse flushurl(uri url)     {         if (url == null)         {             _logger.error("argumentnullexception on url");             throw new argumentnullexception(nameof(url));         }          try         {             _logger.info($"flush url: {url.absoluteuri}");             //every sections has it's own methods.             //but methods not publicly available/described. method found it's methodname, , create instance.             var section = _servermanager.getapplicationhostconfiguration().getsection(diskcachesection);             _logger.debug("section provided");             var method = section.methods[flushurlmethod].createinstance();             _logger.debug("method created");             _logger.debug($"set attribute: {urlmethodattribute}:{url}");             //then set input variabele.             method.input.setattributevalue(urlmethodattribute, url.tostring());             _logger.debug(new detailedlog("attribute setted: ", url.tostring()));              //and execute method.             method.execute();             _logger.info("method executed");              var result = (long)method.output[errorcodestring];             _logger.info($"response: {result}");              return (flushurlresponse)result;         }         catch (exception ex)         {             _logger.error(ex);             return flushurlresponse.error;         }     } 

the server running arr: 3.0.1952

externaldiskcache: 1.1.1949

iis: 8.5

does have idea's?