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("ObjectID could not be found for the supplied tuple")
        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)

    fileHandle = None
    try:
        with open(captureFile, 'wb') as fileHandle:
            for chunk in capturePayload.iter_content(chunk_size=1024):
                fileHandle.write(chunk)
    except IOError:
        log("Could not open or create file, please check path and/or permissions")
        return 2
    finally:
        if fileHandle:
            fileHandle.close()
    
    return 0