1. If you are not able to log on to Registry BLAST, or if your computer cannot connect to the BLAST server, an error message appears in the CAS Registry BLAST window.

Example error messages are

• Logon Failed ("Unknown Host Exception("<hostname>")")
• Logon Failed ("IOException: "Unable to tunnel through <proxy>:8080. Proxy returns "HTTP/1.1 407 Proxy Authentication Required""").
• Logon Failed ("Socket Exception("network subsystem has failed: connect")").

The problem can often be corrected by setting proxy server preferences in CAS Registry BLAST.

Step A: Determine the Proxy Server

Your IT department or internal help desk is best-equipped to tell you if you should use a proxy server and, if so, which proxy server you should use. However, if your web browser is configured with a proxy server, you can try using the same information in CAS Registry BLAST.

We are interested in these aspects of the proxy server:

• the proxy server's name or address
• the proxy server's port
• whether the proxy server is an HTTP or a SOCKS proxy.

Here's how to check your web browser for proxy server information. The steps may vary somewhat with different browser versions.

• How to locate proxy information in Microsoft Internet Explorer.

Use the information from this step to change settings in Step B.

Step B: Configure CAS Registry BLAST

1. After launching CAS Registry BLAST, select Preferences from the tools menu or click the Prefs button.
   
   
   
   
2. Under Proxies, select Firewall, HTTP (which includes HTTPS or Secure), or SOCKS.
3. Enter the proxy server host-name or IP address and the port.  Note:  SOCKS 5 authentication is not supported.  SOCKS 4 or SOCKS 5 without authentication should work.
4. Click Apply.  Click OK to save and exit preferences.
5. Click the Exit button in the Main window to exit CAS Registry BLAST.
6. In your web browser, click Launch CAS Registry BLAST to restart using your proxy server.