...
SecuTix operates several Datacenters with different Internet Service Providers (to ensure high availability), shence, if you want to restrict access of your operators to SecuTix, you have to use an HTTP proxy whcich which will filter on url https://XXX.pos.secutix.com where XXX is your institution code.
Our experience shws shows some instabilities with proxies using NTLM authentication, hence we don't recommend this configuration and SecuTix will not provide support in case of issues.
...