CAS 3.0 client problem with a connection to CAS 3 server after Login

[Matteo Matteo]

Sources: CAS 3.0 Client, CAS 3.07 server
When I configure CAS Client on a server named like:

workstation1.ads.company.com

and CAS server on

testserver.local.company.de

than after redirecting from CAS back to my application (when I've already sent my user name and a password) I ge a following error message.
What may be whrong with a Client (configuration), I've check my ports - they are opened and nobody blocks them inside our network. I think that CAS should work even if we start both: a server and a client on different PCs with different domain names?
Thanks
Matvey

javax.servlet.ServletException: Unable to retrieve response from CAS Server.
	org.jasig.cas.client.web.filter.TicketValidationFilter.doFilterInternal(TicketValidationFilter.java:109)
	org.jasig.cas.client.web.filter.AbstractCasFilter.doFilter(AbstractCasFilter.java:100)
	org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:138)
	org.jasig.cas.client.web.filter.AuthenticationFilter.doFilterInternal(AuthenticationFilter.java:97)
	org.jasig.cas.client.web.filter.AbstractCasFilter.doFilter(AbstractCasFilter.java:100)
	org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:138)


root cause 

org.jasig.cas.client.validation.ValidationException: Unable to retrieve response from CAS Server.
	org.jasig.cas.client.validation.AbstractUrlBasedTicketValidator.getResponseFromURL(AbstractUrlBasedTicketValidator.java:80)
	org.jasig.cas.client.validation.AbstractUrlBasedTicketValidator.validate(AbstractUrlBasedTicketValidator.java:46)
	org.jasig.cas.client.web.filter.TicketValidationFilter.doFilterInternal(TicketValidationFilter.java:91)
	org.jasig.cas.client.web.filter.AbstractCasFilter.doFilter(AbstractCasFilter.java:100)
	org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:138)
	org.jasig.cas.client.web.filter.AuthenticationFilter.doFilterInternal(AuthenticationFilter.java:97)
	org.jasig.cas.client.web.filter.AbstractCasFilter.doFilter(AbstractCasFilter.java:100)
	org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:138)