Licence update error (Every month)

[admin@garantiserver]

I am getting an error while updating SB license every month. I have to send tickets and talk about my problem every month. It's very oppressive for both side.
When I tried Retrieve Keys getting:

Key Authorization Server returns the following error:
Unable to Connect to ssl://ka.parallels.com:5224. Error #140410312:

error.

And while I tried Activation Code method, getting:

Could not activate/renew license. KA server response: Unable to Connect to ssl://ka.parallels.com:5224. Error #140410312:

I have checked my server against a blocking but couldn't identify anything. My system is Centos 5.2. How can I fix this?

Thank you.

 

[admin@garantiserver]

I have fixed problem after 3 months. I couldn't think of having a DNS problem till today because SB was working properly. The problem was about my server DNSs. Check /etc/resolv.conf