ABAP Webdynpro error on 3G Android tablet

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Hi,

I'm collecting ideas regarding the following problem.

I created an own Z webdynpro abap application in our ECC6 SP5 system, it has 3 landscapes, DEV, QUA, PRD.

The webdynpro application is working in DEV system

- on notebooks via WIFI

- on the Nexus 9 android tablet via WIFI and via 3G (with Spain Movistar as provider). We are using Sonicwall app for VPN.

It's working in QUA

- on notebooks via WIFI

- on the Nexus 9 android tablet via WIFI. We are using Sonicwall app for VPN.

It's not working in QUA

- on the Nexus 9 android tablet via 3G (with Spain Movistar as provider). We are using Sonicwall app for VPN.

We tried with different browsers.

Error message:

ERR_CONNECTION_REFUSED

It's a very common error message, so it might be hard to find the source of the problem.

All information is useful, thank you in advance for helping.

Best regards

Tamas