Yes, after "out of memory", dlink601 stopped working with EAPOL 4-way handshake.
Still serving beacon, and can go through probe request, response, open authentication, association request and response, and then access point did not start the EAPOL 4 way handshake.
and, any other wifi device (either LAPtop or iphone) got the same result, access point did not start EAPOL 4 way handshake.
thanks
wendy