from lib.test_config import AUTH_CREDS as AUTH_CREDS_orig

class AUTH_CREDS(AUTH_CREDS_orig):
    enalgs = ('SHA-256', 'MD5-sess', None)

    def __init__(self):
        AUTH_CREDS_orig.__init__(self, 'mightyuser', 's3cr3tpAssw0Rd')

from lib.test_config import AUTH_CREDS as AUTH_CREDS_orig

class AUTH_CREDS(AUTH_CREDS_orig):
    enalgs = ('SHA-256', 'SHA-256-sess', 'MD5-sess', None)

    def __init__(self):
        AUTH_CREDS_orig.__init__(self, 'mightyuser', 's3cr3tpAssw0Rd')

Enable SHA-256-sess to see if it works or not.