Enhanced security features were introduced in 2013 NiagaraAX releases. These updates are discussed in the document NiagaraAX 2013 Security Updates. Some of the updates affect the way tunneling works when using Fox and HTTP tunneling and some new properties are added to Fox and HTTP services.
Problems with client authorization can result when trying to tunnel from upgraded stations to non-upgraded stations.
The “Cookie Digest” setting does not allow authentication between security-upgraded and non-upgraded stations.
Possible workarounds for these situations include:
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Upgrade stations
The best workaround is to upgrade all stations to the 2013 Security Update release.
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Set "Proxy Authentication When Tunneling" to "true" on the upgraded station.
This setting requires the client to manually enter credentials again but allows tunneling.