Ngrok server issue about flask_ask_ros

[LucasPorto]

Hi,

Run ngrok by itself (without starting your flask server), and open the provided ngrok link in your browser. Do you obtain a page saying that your connection tunneled successfuly?

[NikhilKanamarla]

Hey,

So I ran ngrok by itself and stopped the flask server. The connection didn't tunnel successfully and I got a 502 bad gateway error. What do you recommend I do next?

Screenshot: https://photos.app.goo.gl/t3cgxD14dgrL5Q7CA

Thanks,
University of Delaware IDS Lab

[LucasPorto]

This is likely a firewall issue preventing ngrok from communicating with their servers.
My first suspicion is that port 5000 might be closed by your firewall.

Let's try a few things:

1. Try starting ngrok in different ports (port 80 for example):
   ./ngrok http $ROS_IP:80
2. Try starting ngrok in your localhost (port 5000 or other port):
   ./ngrok http 5000
   Try accessing the link and let me know if the connection tunneled properly.

[NikhilKanamarla]

Hey,

I have tried disabling the firewall and your new methods (different ports and localhost) but the link still doesn't work I am getting a 502 bad gateway error.

Screenshoot: https://photos.app.goo.gl/4CKrQqfLd9yN2S1y9

Screenshoot: https://photos.app.goo.gl/4CKrQqfLd9yN2S1y9

Screenshoot: https://photos.app.goo.gl/nNFgPwJkxs28EB2q8

Screenshoot: https://photos.app.goo.gl/aB6b6FfhdL3HFEt58

What do you think should be my next steps? Could we Skype to resolve this issue? I appreciate your time and help.

Thanks,
University of Delaware IDS Lab

[LucasPorto]

Hi Nikhil,

After taking a closer look at your screenshots, it looks like ngrok was working all along: the browser page says that the connection was successfully tunneled, but no webservice is running.

Please follow the instructions under "ngrok tunnel configuration" and send the output of roslaunch.

[LucasPorto]

Also, take a look at this issue, which may be relevant:
https://stackoverflow.com/questions/49375054/alexa-skill-development-using-flask-ask-and-ngrok

[NikhilKanamarla]

I have followed your instructions and the output of roslaunch (roslaunch flask_ask_ros start_skill_server.launch ngrok:=true) was unsuccessful.

Screenshot of error message: https://photos.app.goo.gl/FFsmxGRQDePvzybk8

I have also tried the solution on stack overflow but it seems I already have it installed.

Screenshot: https://photos.app.goo.gl/dWMrcUsBySNeTUSj6

Thanks for your continued support,
UD IDS LAB

[LucasPorto]

Hm, can you try installing cryptography 2.1.4?
pip install cryptography==2.1.4

[NikhilKanamarla]

I installed cryptography 2.1.4 and I am getting the same results. Could you help me with the new error I am getting: https://photos.app.goo.gl/MLqo6VanQZKMa3Du8

Thanks,
UD IDS LAB

[LucasPorto]

Have you tested with the Alexa commands?

[NikhilKanamarla]

Yes and I get a internal server error, I think it would be easier if we just Skyped to resolve this problem

[NikhilKanamarla]

Could it be an issue with port forwarding? I already specified the port forwarding in the Linksys router settings.
Screenshot: https://photos.app.goo.gl/Mi5yvS1Vi9hvimdY6

[NikhilKanamarla]

I fixed it because of the downgrading the pip cryptography

[LucasPorto]

Hi Nikhil,

Could you post the version of cryptography that works?

[MortonDalla]

@NikhilKanamarla just make sure your app server is running first before you run ngrok, it worked for me! 💯