The server can only be accessed from within the university network. If you are connecting via an Internet-Service-Provider (ISP) you need to additionally establish a connection with the Cisco VPN client.
Yes, since Cisco AnyConnect creates a safe tunnel to the RWTH net,
You cannot specify parameters for the 'standealoneinstaller'.
This is only possible for setup files which are provided by the Enterprise Console or the Control Center via CID. A description of the existing parameters can be found here http://www.sophos.com/support/knowledgebase/article/12570.html.
This entry indicates that the cache file of the auto update was blocked by another process and the service was not able to save all downloaded files. This is usually caused by the Windows indexing service. See http://www.sophos.de/support/knowledgebase/article/59494.html.
In order to improve the threat detection rate, you can submit suspicious files to SOPHOS for investigation. This can be done either using a web interface or by e-mail. Further information can be found at https://community.sophos.com/kb/en-us/11490