LM crash

[Thomas]

Do you mean cloud access or remote http services?

It can be just coincidence but since I turned remote requests off my LM is still on with no interruption. Unfortunately the issue is hardly reproducible because it happens once or twice a day.

Remote HTTP access (object set as "export", Remote service Enabled)
I use this service for data exchange between our attendance system and KNX.
The attendance system simply sends update request when doors are opened/closed.


The request looks like this: http://LM_name/scada-remote?m=json&r=grp...1;&value=1


Another interesting part is sometimes response from LM to remote request is extremely slow. I had to set timeout for reply to 20s.

Code written in C# I use in the interface between ACS and LM is simple and is below. It uses synchronous GetResponse .NET 4.0 functionality.

Code:

public HttpStatusCode HttpGetSync(string urlParams)
       {
           string uri;
           HttpStatusCode statusCode = HttpStatusCode.BadRequest;
               
           if (!(restapi.url.Length > 0)) return statusCode;
           if (!(urlParams.Length > 0)) return statusCode;
           uri = restapi.url + urlParams;
           
           HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
           if (netCredential != null)
           {
               request.Credentials = netCredential;
               request.PreAuthenticate = true;
           }
           request.Method = "GET";
           if (restapi.timeout > 0)
           {
               request.Timeout = restapi.timeout;
               request.ServicePoint.ConnectionLeaseTimeout = restapi.timeout;
               request.ServicePoint.MaxIdleTime = restapi.timeout;
           }
           request.ContentType = "text/html";
           request.CachePolicy = reqCachePolicy;
           request.Proxy = null;
           
           request.KeepAlive = false;

           using (HttpWebResponse response = (HttpWebResponse)request.GetResponse()) {
               statusCode=response.StatusCode;
               response.Close();
           } ;
           request.Abort();
           
           GC.Collect();

           return statusCode;
       }