How to use Smacks Plugin + Websocket with Anonymous Domains

Hi everyone,

I want to use smacks pluging with websocket. I configure prosody to be able to join anonymously but require token authentication for creating new room.

Smacks works great for autheticated users because these users reconnect with same xmpp identity.

However, if guest users try to resume, their identities are not the same as they used before. So Smack can not find correct session to resume. It returns that error…

<resume h=‘25’ previd=‘db78152f-fdf8-47db-b0b2-75d61fc9138f’ xmlns=‘urn:xmpp:sm:3’
Tried to resume non-existent session with id db78152f-fdf8-47db-b0b2-75d61fc9138f

Although there is no authentication at, users keep their identity. How can I keep identity for guest users to use Smack Plugin properly.

Note: I use stable-5076 version with prosody-0.11.5. I already apply mod_websocket_smacks.patch and mod_websocket_session_event.patch

Related Link: [How To] How to enable websockets (xmpp-websocket) and smacks for Prosody

1 Like

The username does not matter, what matters is previd id which is passed when resuming …

Maybe something is wrong with the logic when using anonymous domain, the same there was a bug when checking for enabled services and instead of the main domain was querying the guest one … this is my guess.

Can you try this? Use the token auth module, but set allow_empty_token to true. This is basically anonymous, but there is some extra code to match previd.

@damencho This was the motivation for WIP feat(prosody) detacch session resumption from token auth by saghul · Pull Request #8576 · jitsi/jitsi-meet · GitHub

I see @saghul

O Man!! Not all heroes wearing capes!!

I saw that code which set previd etc…

It works thank you… :slight_smile:

Hi @damencho

Session.username is equal to uuid part of
so both session.username and previd is required.

with @saghul suggestion, when new websocket created, start to come with same uuid.

Hi again :slight_smile:

I faced with new problem about jvb websocket after resume. After i force to resume prosody websocket, I trigger colibri websocket to reestablished also. Sometimes i faced with these errors,

  • Client Side:

lib-jitsi-meet.min.js?v=420:17 WebSocket connection to ‘wss://’ iled: Error during WebSocket handshake: Unexpected response code: 403
_initWebSocket @ lib-jitsi-meet.min.js?v=420:17
t @ lib-jitsi-meet.min.js?v=420:17
lib-jitsi-meet.min.js?v=420:10 2021-02-25T08:28:41.116Z [modules/RTC/BridgeChannel.js] <WebSocket.e.onclose>: Channel closed by server
lib-jitsi-meet.min.js?v=420:10 2021-02-25T08:28:41.117Z [modules/RTC/BridgeChannel.js] <WebSocket.e.onclose>: Channel closed: 1006

  • JVB Side:
    Several logs like,
    [confId=9d71074c099283d0 epId=b9922c6b gid=413976 stats_id=Viola-0g8] VideoParser.transform#74: Unable to find encoding matching packet! packet=RtpPacket: PT=100, Ssrc=358628010, SeqNum=53464, M=true, X=true, Ts=1460079164, encodings=MediaSourceDesc 1604882424 has encodings:#012 primary_ssrc=358628010,secondary_ssrcs{404737831=RTX},layers=subjective_quality=0,temporal_id=-1,spatial_id=-1

At that stuation, if there was a screen sharing, resumed participant can see sharing at small thumbnail but not at main video section. did you faced with that problem before?

After resuming, Backend send new colibri websocket url as follows,

<transport xmlns="urn:xmpp:jingle:transports:ice-udp:1" pwd="276g0gb0loos3naa8viqshb165" ufrag="4r33l1evc42cvc">
<web-socket xmlns="" url="wss://" />

Client open this new websocket but also try to open old one also. Probably old one has invalid pwd at that moment. There is lots of failed colibri websocket exist…

As i suspect:
jvb: WARNING: [767779] [confId=9d71074c099283d0 epId=0f42bd80 gid=413976 stats_id=Viola-0g8] Endpoint.acceptWebSocket#969: Incoming web socket request with an invalid password. Expected: 276g0gb0loos3naa8viqshb165, received angft2hueg0537bhniv7564cm

Hi again,

When i update JVB to latest stable version 5390, that problem is also solved… With stable 5076, after user resumed, there is problem with jvb websocket which i mention about.

for your information :slight_smile:

Good to know @engesin , cheers!

1 Like

After setting up ejabberd, I can enroll users from multiple devices at the same time, and also log in multiple users, and users can communicate correctly, but the problem is when I quickly enroll multiple users from one mobile device.

How is that related to the discussion here?

Hi again,

When 3 ping requests are timeout, smacks restores session. This makes 30 seconds to recover.

How can I shorten this duration?

Can I change ping interval or accept connection lost if 2 ping request are timeout?

thank you

You can control this with config like:

    xmppPing: {
	interval: 10000,
	timeout: 5000,
	threshold: 2

Thank you @damencho,

Do i need to change anything at prosody side? for example if client goes to offline, we kick that client after a while. does this change effect prosody websocket timeout?

Are you using bosh or websocket for the signaling (mind that this is different than the websocket that is used for the jvb connection)?
In case of bosh you can control the timeout through property in prosody, but for it you need to use a custom lib-jitsi-meet with custom strophe.js build with a change for the timeout, cause per specs the timeout for bosh is 60 secs and that is hardcoded in the library.

For websockets there is no timeout as it is not a long poll as bosh, if the connection is dropped the session is destroyed.

Ok I use Websocket.

therefore, I just need to modify


Hi again,

After smacks restores session, Client connection seems to be poor.

When i investigate jvb websocket message, i see that client sends connectionQuality as 0.

So ones that recover their websockets has wrong indicator for me.

Is this a known issue?

“type”: “stats”,
“values”: {
“bitrate”: {
“upload”: 24,
“download”: 201,
“audio”: {
“upload”: 24,
“download”: 80
“video”: {
“upload”: 0,
“download”: 121
“packetLoss”: {
“total”: 0,
“download”: 0,
“upload”: 0
“connectionQuality”: 0,
“jvbRTT”: 12,
“maxEnabledResolution”: 1080