Connecting Nexus 5K to HP 3800 stack on vPC

As the title says, I am connecting a stack of 3800 switches to a Nexus 5K pair using a virtual Port Channel. However, the second connection never comes up, and in the one case we've had where connection 1 goes down, the second connection didn't take over. Is anyone out there doing this successfully?
Thanks,
Russell
     +------------+__________+------------+
     | Nexus 5K |__________| Nexus 5K |
     +------------+    vPC   +------------+
          |                          |
        c|                          |
         o|                          |
         n|                          |
         n|                          |c
          |     +------------+      |o
         1+------| HP 3800-1 |      |n
                 +------------+      |n
                      |S|            |
                      |T|            |2
                      |A|            |
                      |C|            |
                      |K|            |
                 +------------+      |
                 | HP 3800-5 |------+
                 +------------+

Duplicate of connect nexus 5k to hp 3800 via vPC in the LAN forum.

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no, no secret aukhadiev
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