Problem to conect to my cloud outside my home

My Cloud OS 3 Personal & Network Attached Storage My Cloud
5

 I do all that this guide said

http://community.wd.com/t5/WD-My-Cloud/HOW-TO-Troubleshooting-Remote-Connectivity-Issues/m-p/617261#U617261

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A week ago, all did work fine, I don’t believe that change the firmware solve the problem. I don´t want change the firmware because, it does not allow third party apps instalation using apt-get