Exchange 2016 ECP No Access

Hi,
  I came into work this morning to see an pop up on outlook mentioning that our exchange.h*******y.co.uk certificate had expired. I quickly went to renew the certificate (although i am unsure it went well) however since that the pop ups on outlook seem to have gone. The problem i have is when access ECP i get a "This site can't be reached" looking in IIS it appears that the default site uses 443 and the Exchange back end uses 444 it was working before the certificate renewal so can't be anything to do with the fact it's 444 HOWEVER if i change it to 443 it does get me a bit further in that i get a "400 Bad Request :( The Request sent by your Browser was not valid"

 I have sort of hit a brick wall here and am looking for some advice to get this fixed.

We are on office365 for mail and have exchange server running Exchange 2016

Thankyou
Tom FieldenAsked:
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Scott CSenior EngineerCommented:
It might be because you didn't renew your certificate.  It's been a while since I've had one of these, but your certificate expired.  You need to treat it like a new install of a cert and not a renewal.

At least that's what I remember having to do a couple of years ago.
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Delphineous SilverwingGood Ol' GeekCommented:
No comment has been added to this question in more than 21 days, so it is now classified as abandoned.

I have recommended this question be closed as follows:

Accept: Scott C (https:#a42073957)

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