Microsoft VPN fails to connect clients after moving the VM from ESX 5 to a new ESX 5.5 host

Over the weekend we replaced some aging hardware for a client running 6 servers on a ESX 5 host. We migrated all VMs using Veeam to a new ESX 5.5 host without issue. The only issue that has cropped up and I am scratching my head over is that the Microsoft RAS VPN service is failing to authenticate and connect VPN clients after the move.

We have made no server configuration changes. I migrated it twice two different ways and still have the same issue. I did a quick migration from host to host and I did a complete backup and restore. I even tried setting RAS up on a different server with the same affect.

If I turn the old VM on on the old host it works perfectly. Any ideas?
safeharborAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
How did you migrate the VMs using Veeam ?

Have any networking, IP Addresses, Mac Addresses Changed ?

Firewall Changes ?
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safeharborAuthor Commented:
Yes I did migrate using Veeam. We made no changes. Just migrated vm's to a new host.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
When you powered on the VMs no questions about Move or Copied?

All services are started that should be started ?
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safeharborAuthor Commented:
Issue is solved. There is a known issue with ESX 5.5 using the E1000 virtual NIC and PPTP. I created a second NIC using the vmxnet3 type and reconfigured RAS to use it instead. Problem solved. There is a patch for ESX but this was the simplest solution.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
You should *ALWAYS* use the VMXNET3 interface!

E1000 is only useful for installations of an OS!

If using PPTP, you also may want to look and investigate as to whether it's a security risk, since it's become vulnerable!
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safeharborAuthor Commented:
Thx for the info
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Not a problem.
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safeharborAuthor Commented:
This solution came as part of a VMware support call and quickly resolved the issue.
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