if (extant != null) {
// Then, already tried this credential. Remove ANY rfc2617
// credential since presence of a rfc2617 credential serves
// as flag to frontier to requeue this curi and let the curi
// die a natural death.
extant.detachAll(curi);
logger.warning("Auth failed (401) though supplied realm " + realm
+ " to " + curi.toString());
} else {
// Look see if we have a credential that corresponds to this
// realm in credential store. Filter by type and credential