This sounds like slow ticket replication. Does redis sentinel have multiple 
If you set nginx to be sticky, will validation succeed?

Check your cas logs to see if the ticket is being validated. I think the cas 
client tries to validate the ticket using https.

You could simplify your config:
location /cas
proxy_pass http://cas.server/cas


On Fri, 2018-08-03 at 22:28 +0530, Ramakrishna G wrote:
Hello all,

I am using Mod_auth_cas and HA- Cas server behind a loadbalancer.

Whenever I set CASValidateURL to one of the cas servers it works fine. But when 
I send to cas via NGINX server then it says "Unauthorized error" in browser.

My Nginx has

 location /cas/login
        proxy_pass  http://cas_server/cas/login;

 location /cas/serviceValidate
        proxy_pass  http://cas_server/cas/serviceValidate;

 location /secured

My cas.conf has

LoadModule auth_cas_module modules/mod_auth_cas.so
CASCertificatePath /etc/pki/tls/certs/
CASCookiePath /var/cache/mod_auth_cas/
CASLoginURL http://localhost:81/cas/login // Works fine
CASValidateURL  http://localhost:81/cas/serviceValidate // Pointing to NGINX
#CASValidateURL  http://localhost:8080/cas/serviceValidate // Pointing to one 
of the cas server - Works fine
CASDebug On
LogLevel debug

No error as well. I am not sure where I am going wrong.

Can anyone help please.

Ramakrishna G

Ray Bon
Programmer analyst
Development Services, University Systems
2507218831 | CLE 019 | r...@uvic.ca

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