Dvport link is getting down abruptly on dvswitch

     Hi,
The dvport links for virtual machines on a particular host in a cluster are going unavailable randomly. I am using a dvswitch with 256 ports. There are good number of free ports available. But the virtual machines' dvport links are going down. One we replace the vNIC with new one the VM starts communicating over network.
I am using vsphere 5.
What might be the root cause and how can this be resolved?

Has this VPN setup ever worked prior to you taking over?  If so, do you know of any changes that have been don't to the firewall configuration that could possibly have caused the issue?
Another thing to check out is why the DMZ interface is enabled for VPN.
I suggest making the following change and then test to see if the VPN comes up
no crypto map outside_map 65535 ipsec-isakmp dynamic outside_dyn_map
crypto map outside_map 65535 ipsec-isakmp dynamic SYSTEM_DEFAULT_CRYPTO_MAP
If that solves the problem, next I would check your company's security policy to see if they require a Diffie Hellman group to be used during phase 2 of the VPN setup.
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