Any open issue on yppush from 4.9 to 4.10

[Jin Guojun [NCS]]

It seems that pushing YP from 4.9 to 4.10 does not work.
Case:
    YP master is 4.9
    YP slave is 4.10

In 4.9 (master) host in /var/yp directory, typing make (with PUSH enabled),
nothing is updated on 4.10 slave.
Tcpdump shows that infinite data transfer happens between 4.9 and 4.10 hosts
over YP ports.
Just want to know if there is known problem on this issue before starting
further
investigation.

Thanks in advance for any related information.

    -Jin