VPN Error 766 a certificate could not be found

My users have suddenly started getting this error when trying to connect their VPN after not having a problem.  We do not use certificates to authenticate, we use a pre-shared key.  Our settings are as follows -

vpn.goptions.co.uk - our VPN link, the only certificate involved is a wildcard one we own (*.goptions.co.uk) which we recently had issues with because it was revoked by Godaddy without any warning - but not sure how this affects our VPN i.e. where would I renew the certificate in NPS?

We use L2TP/IPSEC with MS CHAPV2.

When you connect to it and try username and password, very quickly you get the "Error 766 A certificate could not be found. Connections that use the L2TP protocol over IPSEC require the installation of a machine certificate, also known as a computer certificate"

I have a diagnostics log but will not attach for now as it is rather large and not sure if needed.

I'd be very grateful of any assistance here.
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fuzzyfreakAsked:
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fuzzyfreakConnect With a Mentor Author Commented:
This issue was purely down to using a VPN connection with no pre-shared key entered (I think certificate is the default option, so it was looking for one).
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Schuyler DorseyCommented:
Did the certificate expire? Even if you aren't using 2 factor auth, the VPN endpoint itself has to at minimum have a self-generated certificate to establish an encrypted connection.
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Schuyler DorseyCommented:
Ah okay. Great to hear you got it resolved!
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fuzzyfreakAuthor Commented:
Self resolved.
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