Cas server could not validate ticket

[lkhelif]

Hello,
I have an Alfresco installed (4.2.e) with LDAP synchronization and SSO CAS authentication.

After CAS login, Share receive an invalid ticket response from CAS server.

Here are http headers:

GET http://my_server/share/
GET https://cas_server/cas/login?service=http://myserver/share/
GET http://my_server/share/?ticket=ST-2931-LYrBo9hCMFETO4qkA4fe-cas

GET http://my_server/share/res/themes/default/images/app-logo.png
GET https://cas_server/cas/login?service=http://my_server/share/res/themes/default/images/app-logo.png
GET http://my_server/share/res/themes/default/images/app-logo.png?ticket=ST-2932-cubPEhbpxKEMBZZapUXX-ca...

The second part is the one that causes invald ticket response, but I don't understand the reason of such call.

Does anyone have an idea?

[lkhelif]

The problem was in the DNS server that was too slow to resolve the cas server domain name.