Interconnection between HP and Cisco is not working

Dear all,
I support some old colleagues by connecting a Cisco 2960x with an HP Switch. Both sides are UP/UP, stp is fine, channel also. The Cisco switch is also fine. But not data traffic is working.
I see that we are sending but not receicing any packet. the same on the other side. We checked the cabeling use different fibers, etc. everything is fine. when we connect a copper port, its also fine. Online on the LWL side we have this problem. But interface and line protocol is UP.
Is there any command I may not know to check the LWL. UDLD is not working because we have just on cisco on one end. test tdr works only on copper. I guess there is something wrong with the compatibility between the both Gbics, but i can't exaclty say what it is. We use monomode and LX Gbic. 
On another Core Switch HP/Cisco is working finde with SX.
I don't have live access, so sorry for any delay in my answer.
regards,
Sebastian

Hi cbafiero,
It seems that the problem lies in your router. I'm not sure exactly what the issue is (I've just now discovered it myself), but after switching from a Linksys WRT54GX2 to a thrift store Netgear, my shared libraries appeared instantly. My gut is telling me that the Linksys routers are blocking the multicast traffic, which is stupid on Linksys's part, to filter traffic internally. I'll look more into the Netgear and see what it has that the Linksys doesn't (or vice versa).

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