Zoho SAML not working

Zoho SAML not working

Hi,

I am trying to set up SAML for Zoho mail. I am using ADFS 3.0 as a backend on our side.
When a user goes to the SSO url, the user gets redirected to our ADFS server, gets authenticated and then gets redirected back to Zoho. The last step is where it goes wrong. I get the following error message:

Signature validation failed.
 

The Possible reasons could be :
  • 1. It is possible that you typed the address incorrectly.
  • 2. The URL may be invalid.


A year old thread talked about this, and the problem being the cert. I tried converting my token signing cert to PEM and uploading it, but this hasn't helped. I tried a lot of different formats, but none seem to work.

How do I go about troubleshooting this? I can't find any logging on the Zoho side of things for this, and my ADFS server shows nothing wrong (as it happily accepts the incoming requests and does the auth and then redirects back).

Any suggestions are welcome :)