Websocket Upgrade Required when Connect with GSM Modem Module

[Imam Abdul]

Hello.

Please give me some advise.
When I try to connect with web socket with GSM Modem I get error message "connection was closed uncleanly (WebSocket connection upgrade failed (426 - UpgradeRequired))"

But when I use LAN Connection my program run correctly and can connect.
I use autobahn twisted v15.4 in my client program and use websocket ws java script in server program.

There is additional setting when I use GSM Modem to connect websocket?

Thank you.

[Alexander Gödde]

Hi!

Without more information it is impossible to say anything about the error, since the error could be anywhere from the modem software stack to your provider's network.

Regards,

Alex

[Imam Abdul]

Hi Mr Godde,

That is debug message from my application.

[Geordie Millar]

Does your 3G provider have a transparent web proxy that's causing problems because it doesn't understand WebSockets? I've seen that issue before with a few things...

Try running it over SSL and see if the problem goes away.

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[Imam Abdul]

​
thank you, I try to use ws and it can connect but sometimes I get error message like in this picture.
How can this error message come?
Thank you

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Regards,

Imam Abdul Mahmudi

S1 Teknik Fisika

Universitas Telkom

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