Sean,

This looks like your clock is incorrect.
Use a tool like samltracer to see what is being passed.

You do not want to have large lifetime windows on authentication responses, to 
limit replay attacks.

Ray

On Wed, 2020-11-25 at 10:15 -0800, Sean Day wrote:
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Hi,

I have CAS 6.2 configured to authenticate against Azure AD, I have some users 
that are getting an error:

org.pac4j.saml.exceptions.SAMLAuthnInstantException: Authentication issue 
instant is too old or in the future

It seems to be browser/PC dependent, if they try a different PC it is OK, the 
assertion seems to be very old in some cases (months old). It only seems to 
affect CAS based SAML logins though, authenticating against Azure AD directly 
for O365 for example works as expected.

I know I can workaround this by increasing the setting but does anyone know why 
I would need to (I already have it set for about 3 months and need to increase 
it further and I am guessing would have to do this again in the future if I 
cannot find the cause.

Thanks

Sean

--

Ray Bon
Programmer Analyst
Development Services, University Systems
2507218831 | CLE 019 | r...@uvic.ca<mailto:r...@uvic.ca>

I respectfully acknowledge that my place of work is located within the 
ancestral, traditional and unceded territory of the Songhees, Esquimalt and 
WSÁNEĆ Nations.

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