Cannot connect to SSL VPN using AD authentication as of this morning

Customer has a USG60W, has worked well for 3 years.
Had power issues overnight. I went onsite, reset breakers, reset cable modem, USG, and switch, and server.
Internet is up and works well. Local network works well.
Users connect to SSL VPN using AD authentication. Test in GUI works.
No one can connect. 
I did latest firmware update, using latest SecuExtender software.
I went through setup step by step twice to make sure everything was correct.
Any thoughts what to do next?

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