Proxy and Host should have same level of security upgrades, or tunneling may not work or require workarounds, see About 2013 Security updates. In addition, requirements for Fox tunneling include the following:
Client Requirements
The client station must be running NiagaraAX-3.3 or later and have network access to a "Proxy" station.
Proxy Requirements
The Proxy station must be licensed for Fox tunneling and be running NiagaraAX-3.3 or later 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 Server”, below).
Host Requirements
The host station (or targeted station) needs to be able to provide an accessible network IP address to the Proxy server. The targeted host must be running a NiagaraAX-3.3 or later station.
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