TURNS (TURN with TLS/DTLS) socket buffer operation error

[532910]

I've installed and configured coturn daemon for tls and plaintext listeners.
It work fine, while connection is plaintext: turn_uris: [ "turn:domain.tld:3478?transport=udp", "turn:domain.tld:3478?transport=tcp" ]

testssl.sh domain.tld:5349 and testssl.sh domain.tld:3478 also shows no errors.

But when I use
turn_uris: [ "turns:domain.tld:5349?transport=udp", "turns:domain.tld:5349?transport=tcp" ]
or
turn_uris: [ "turns:domain.tld:3478?transport=udp", "turns:domain.tld:3478?transport=tcp" ]

turnserver reports an error: session closed ... reason: TLS/TCP socket buffer operation error (callback)

[richvdh]

that sounds more like a client bug than a synapse one? turn_uris is used solely to populate the response to the /voip/turnServer endpoint.

[532910]

Agree. Should I open new three separates issues for riot-android, riot-web, and riot-ios?

[richvdh]

if it's affecting all those clients, I guess so.

[jryans]

If all clients are affected, I would maybe start with riot-web and mention it affects the others as well, rather than fragmenting the conversation across 3 issues. (For the moment, it sounds like a TURN server configuration issue or coturn bug, but it's hard to be sure.)

[532910]

riot-web works fine
element-hq/element-ios#2712 element-hq/riot-android#3299