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vMotion fails after upgrade from esxi 5.1 to 6.0 (build 4510822)

We were able to migrate all VM to other hosts before the upgrade (from 5.1 to 5.1 and from 5.1 to upgraded 6.0.) But now it fails to migrate from esxi 6.0 to another esxi 6.0. We get this error.

Failed to write checkpoint data (offset 519521, size 1079): msg.vmk.status.VMK_TIMEOUT.

vMotion migration [173673070:1477295909404336] failed to read stream keepalive: Connection closed by remote host, possibly due to timeout

Failed waiting for data. Error 195887167. Connection closed by remote host, possibly due to timeout.

We are able to power off a VM and then migrate it - but not with an online VM.

I have read quite a lot of articles that this was an issue with earlier versions and an update should fix this. But this update is older than the build we are running.??

any ideas ??

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