Failed by DTLS error

[ajaxkulkarni]

Hello.
I am getting failed by DTLS error intermittently. The code works well from desktop browsers (Chrome and Firefox) bur fails in Android Chrome and Firefox.
I am using TLS version 1.2 on my server.
Please help me solve this issue. It's impacting our business big time.

 

[Max]

By default DTLS 1.2 is used for all browsers.

dtls_force_version_0 = false

You can force DTLS 1.0 for old browsers listed in WCS_HOME/conf/dtls0_ua

DTLS support for WebRTC streaming - Web Call Server 5.2 - EN - Flashphoner Documentation

docs.flashphoner.com

 

[ajaxkulkarni]

By default DTLS 1.2 is used for all browsers.

dtls_force_version_0 = false

You can force DTLS 1.0 for old browsers listed in WCS_HOME/conf/dtls0_ua

DTLS support for WebRTC streaming - Web Call Server 5.2 - EN - Flashphoner Documentation

docs.flashphoner.com

It's intermittently failing from Android Mobile Chrome browser. Works well with Desktop chrome. My mobile chrome browser version is latest (81) which supports DTLS 1.2. It works on some other Android devices.
Tried changing 'dtls_force_version_0' to true /false with no luck.
Can you guide me as to what I can do more to troubleshoot.

This is the ERROR message I get -
DtlsError - Stun-Clbk-thread udp//172.104.47.180:31004 User-agent: Mozilla/5.0 (Linux; Android 9; POCO F1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Mobile Safari/537.36; alert level: 2; alert description: 80; message: null

 

[Max]

alert level: 2; alert description: 80;

This means DTLS connection is not established by some handshake failure (usually due to packet loss).
Please revert dtls_force_version_0 to default state (set

dtls_force_version_0=false

or just remove the parameter from flashphoner.properties
Then, set the following parameter

dtls_close_socket_after_tries=30

to increase DTLS connection establishing tries count, it should help in this case.

 

[ajaxkulkarni]

This means DTLS connection is not established by some handshake failure (usually due to packet loss).
Please revert dtls_force_version_0 to default state (set

dtls_force_version_0=false

or just remove the parameter from flashphoner.properties
Then, set the following parameter

dtls_close_socket_after_tries=30

to increase DTLS connection establishing tries count, it should help in this case.

Tried this and did not work.
Could it be related to SSL as we use open SSL on our server. The TLS version is 1.2.

 

[Max]

Please try to use another network from mobile device (Wi-Fi instead of 3G), preferably the same network as desktop from which publishing works.
If switching to another network does not help please collect a report as described here including traffic dump on server side, then send it to support@flashphoner.com, we will check.

 

[Max]

We checked your logs.
Seems like you've set DTLS 1.0 explicitly for Android devices. Please remove dtls0_ua file or rename backup:

mv -f dtls0_ua_bkp dtls0_ua

then restart server.

 

[ajaxkulkarni]

We checked your logs.
Seems like you've set DTLS 1.0 explicitly for Android devices. Please remove dtls0_ua file or rename backup:

mv -f dtls0_ua_bkp dtls0_ua

then restart server.

Hi Max,
I tried what you said and removed the dtls0_ua file and restarted the server. Still I get the same error.
Here's how my config folder looks now -

 

[Max]

Hello,

Then please again collect a report with traffic dump on server side and send to support@flashphoner.com.

 

[Jai Saravanan]

Any update on this issue @Max. Thanks in advance for your support.

 

[Max]

Hello

This issue has been closed on May 2020.
Please create a new thread with new set of logs and reports if you have similar issue.