IIS webpage started to show This page can’t be displayed Turn on TLS 1.0, TLS 1.1, and TLS 1.2 in Advanced settings and try connecting to

ggntt
ggntt used Ask the Experts™
on
Hi,

Last Monday the IIS webpage started to show the below.

A temp fix that held was put in place and all was good without finding out why. Then today ( Monday) same again.


This page can’t be displayed

Turn on TLS 1.0, TLS 1.1, and TLS 1.2 in Advanced settings and try connecting to https://name.domain.ie  again. If this error persists, it is possible that this site uses an unsupported protocol or cipher suite such as RC4 (link for the details), which is not considered secure. Please contact your site administrator.

Of course the TLS 1.0 are turned on and doesn't matter what browser you use.

I uninstalled updates that where applied on the Friday before but no different

I created a self assigned cert that worked where the users can click on 'Continue' to get to the page.

What could make the IIS do this on a Monday?

Windows 2012 R2
IIS v7

-Regards

-Ggntt
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Exec Consultant
Distinguished Expert 2018
Commented:
Suggest you run a test on the site if it online accessible. This will render the list of supported cipher and state of the site that is likely containing weak cipher. https://www.ssllabs.com/ssltest/
I am thinking if the certificate with the updated cipher support has been correctly bind to the website and typically there are a couple of certificate left and the server may have tagged it wrongly. IN fact the https lock icon will reveal the certificate in place.
Also just last week there is MS bulletin update but it does not have IIS related update per se though it include other Windows kernel update and appl. I doubt it is pertaining to the update.
https://technet.microsoft.com/library/security/ms16-sep
btanExec Consultant
Distinguished Expert 2018

Commented:
As per advised on the retest to validate findings again

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