You’ve completed the configuration of your Citrix NetScaler VPX 9.3 as an Access Gateway to your internal Web Interface servers but when you attempt log in:
… the web interface login splash page flashes and you receive the following error:
This error is usually related to your Web Interface servers unable to communicate to your NetScaler VPX’s VIP IP. Ensure that the firewall or web filter between your Web Interface server and your NetScaler VPX’s VIP (usually a DMZ or public IP) is allowing port 443 (SSL) traffic through. The easiest way to test is to log directly onto your Web Interface server and try to initiate a “telnet <NetScaler VIP> 443”. If you are unable to establish a connection over then check to ensure traffic is flowing correctly.