def retrieveCaptureFileForPorts(connection, sessionUrl, communityPortIdTuple, captureFile):
    '''
        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
        - communityPortIdTuple is a tuple composed of (communityID and portName)
            - communityID is the id of the community list for which captures should be retrieved.
            - portName is the name of the port for which ('1.5.1', not 'Port 1.5.1')
        - sessionUrl is the address of the session on which the test was ran.
        - captureFile is the save path for the capture file

        Error Codes:
        - 0 No error
        - 1 Invalid portId
        - 2 Cannot create/open captureFile

    '''
    communityObjectID, portID = communityPortIdTuple
    portObjectID = getPortObjectId(connection, sessionUrl, communityPortIdTuple)
    if portObjectID is None:
        log("Error: Port objectID could not be found for port with ID: %s" % (portID))
        return 1

    captureFile = captureFile.replace("\\\\", "\\")

    portUrl = sessionUrl + ("/ixload/test/activeTest/communityList/%s/network/portList" % communityObjectID)
    captureUrl = portUrl + "/%s/restCaptureFile" % portObjectID
    capturePayload = connection.httpRequest('GET', captureUrl, downloadStream=True)

    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:
        log("Error: Saving capture failed. Could not open or create file, please check path and/or permissions. Received IO error: %s" % (str(e)))
        return 2
    except Exception as e:
        log("Error: Saving capture failed. Received the following error:\n %s" % (str(e)))
        return 2
    else:
        log("Saving capture finished.")
    
    return 0