IDP broken for Portal using ADFS

[CarlVon_Stetten1]

We've had Portal for ArcGIS (first 10.3.1 then 10.4.1) running for almost two years.  For at least the past year, it has been integrated with our ADFS system for single sign-on.  Last week (although it could have happened earlier than that) we started getting this error: 

Unable to login using Idp Unable to validate SAML response

According to our IT department, nothing has changed on our ADFS server, and our site certificates have not expired (they should be good through some time in 2019).  I have not been able to find any way to resolve this problem.  We are totally unable to sign in to Portal to do any management tasks.

Can someone offer any suggestions on what we need to do to fix this?

Thanks,

-Carl

[MinottKerr]

Did you ever get any response to this? Were you able to resolve this? Thanks!

[CarlVon_Stetten1]

Sort of...  It seems that once a year something times out.  We just have to go back into the Portal security settings and repoint it to the metadata URL from ADSF.  Once it rereads that data, everything is fine.

[MinottKerr]

Thank you.

[MichaelDeibert]

how do i get into Portal security settings when SAML is down?   Always tries to login using SAML and SAML is broke.