Passive optical fibertap question

Hi,

We've recently setup a passive optical tap and we wired everything into one server. Tapping 2 links so a total of 4 TX fibers on the server.

However we have an issue with getting the links up an running. We are using a XL710 4x10G with 4 x LX sfp. Whenever there are auto negotiate packets on the real links the interfaces will come up. But after a reboot they will stay down.

We've tried using ethtool to force the links to 1000 FD and autoneg off but we cant get it to work. Any idea's?

Thanks!