This article applies to:

• SWG 9.x , 10.x , 11.x

Symptoms:

• When downloading files the download page keeps reappearing or giving a 555 internal server error at the end

Causes:

• Client requests file, via LB, from scanner A ->scanner A starts the download and sends the status page to the client -> When download/scan is complete the scanner sends a redirect response to the client with a url pointing to the file location on the scanner and parameter with the scanner ip. -> client follows the redirect url and the LB directs it this time to scanner B -> scanner B checks if the scanner IP address in the request parameter is his IP address.
  • If it is his IP address (A==B) , it returns the scanned file to the client
  • If its not his IP address, it connects to that IP address (scanner A which holds the downloaded file) and streams the file back to the client.

Resolution:

Two options:

1. Use a free network interface on each scanner to assign it the IP that we see in the GUI, in a way they can connect to each other. e.g. As a VLAN that only the scanners can see.
2. Disable the status page feature.