Big file stream is not returned with rest service

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ASP.NET

C#5.0

API

I have a REST GET API that is written using WCF library to return Stream of a specific requested file that is located on API server that hosts that web service application. The service works well if the size of the requested file is small; that is less than 100 MB. But if file size is greater than > 100 MB, then the service returns 0 bytes without any logged information I can get the library method (saying, the catch block).

The library method (the class library project) returns Stream of needed file is

public Stream GetFile(string fileId, string seekStartPosition=null)
        {
            _lastActionResult = string.Empty;
            Stream fileStream = null;

            try
            {
            Guid fileGuid;
            if (Guid.TryParse(fileId, out fileGuid) == false)
            {
                _lastActionResult = string.Format(ErrorMessage.FileIdInvalidT, fileId);
            }
            else
            {
                ContentPackageItemService contentItemService = new ContentPackageItemService();
                string filePath = DALCacheHelper.GetFilePath(fileId);

                if (File.Exists(filePath))
                {
                    fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read);

                    long seekStart = 0;
                    // if seek position is specified, move the stream pointer to that location
                    if (string.IsNullOrEmpty(seekStartPosition) == false && long.TryParse(seekStartPosition, out seekStart))
                    {
                        // make sure seek position is smaller than file size
                        FileInfo fi = new FileInfo(filePath);
                        if (seekStart >= 0 && seekStart < fi.Length)
                        {
                            fileStream.Seek(seekStart, SeekOrigin.Begin);
                        }
                        else
                        {
                            _lastActionResult = string.Format(ErrorMessage.FileSeekInvalidT, seekStart, fi.Length);
                        }
                    }
                }
                else
                {
                    _lastActionResult = string.Format(ErrorMessage.FileNotFoundT, fileId);
                    Logger.Write(_lastActionResult,
                        "General", 1, Constants.LogId.RESTSync, System.Diagnostics.TraceEventType.Error, System.Reflection.MethodBase.GetCurrentMethod().Name);
                }

            }
      }
      catch(Exception ex)
      {
          Logger.Write(ex,"General", 1, Constants.LogId.RESTSync, System.Diagnostics.TraceEventType.Error, System.Reflection.MethodBase.GetCurrentMethod().Name);
      }

     return fileStream;

    }

API method on the client side project (where .svc file is):

[WebGet(UriTemplate = "files/{fileid}")]
        public Stream GetFile(string fileid)
        {
            ContentHandler handler = new ContentHandler();
            Stream fileStream = null;
            try
            {
                fileStream = handler.GetFile(fileid);
            }
            catch (Exception ex)
            {
                Logger.Write(string.Format("{0} {1}", ex.Message, ex.StackTrace), "General", 1, Constants.LogId.RESTSync, System.Diagnostics.TraceEventType.Error, System.Reflection.MethodBase.GetCurrentMethod().Name);

                throw new WebFaultException<ErrorResponse>(new ErrorResponse(HttpStatusCode.InternalServerError, ex.Message), HttpStatusCode.InternalServerError);
            }

            if (fileStream == null)
            {
                throw new WebFaultException<ErrorResponse>(new ErrorResponse(handler.LastActionResult), HttpStatusCode.InternalServerError);
            }

            return fileStream;

        }