Proxy and Host should have same level of security upgrades, or tunneling may not work or require workarounds, see About 2013 Security updates. Requirements for HTTP tunneling include the following:
HTTPS not supported.Https tunneling is not supported.
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Client Requirements
The client station must have a standard browser and network access to a "Proxy" station.
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Proxy Requirements
The Proxy station must be licensed for HTTP tunneling and be running NiagaraAX-3.3 on a network with an IP address that is available to the Client. Also, the Proxy station must have Tunneling enabled (see Enabling a Tunneling Web Server, below).
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Host Requirements
The host station (or targeted station) needs to provide an accessible network IP address to the Proxy server and must be running NiagaraAX-3.3.