def retrieveCaptureFileForAssignedPorts(connection, sessionUrl, captureFolder):
    '''
        This method is used to retrieve capture files from a rest session which had portCapture set to True.

        Args:
        - connection is the connection object that manages the HTTP data transfers between the client and the REST API
        - sessionUrl is the address of the session on which the test was ran.
        - captureFolder is the folder where the capture file will be saved

    '''
    communityListUrl = "%s/ixload/test/activeTest/communityList" % sessionUrl
    communityList = connection.httpGet(communityListUrl)
    captureFolder = captureFolder.replace("\\\\", "\\")

    for community in communityList:
        portListUrl = "%s/%s/network/portList" % (communityListUrl, community.objectID)
        portList = connection.httpGet(portListUrl)
        for port in portList:
            captureUrl = portListUrl + "/%s/restCaptureFile" % port.objectID
            capturePayload = connection.httpRequest('GET', captureUrl, downloadStream=True)
            captureName = "Capture_%s_%s.cap" % (community.objectID, port.id)
            captureFile = '/'.join([captureFolder, captureName])
            log("Saving capture file %s..." % (captureFile))
            try:
                with open(captureFile, 'wb') as fileHandle:
                    for chunk in capturePayload.iter_content(chunk_size=1024):
                        fileHandle.write(chunk)
            except IOError as e:
                raise Exception("Error: Saving capture failed. Could not open or create file, please check path and/or permissions. Received IO error: %s" % str(e))
            except Exception as e:
                raise Exception("Error: Saving capture failed. Received the following error:\n %s" % str(e))
            else:
                log("Saving capture finished.")