Websocket over devtunnel is not working

[flvcode]

I am trying to connect a websocket over the devtunnel but the connection is not fully established.
I am trying using the wss:// protocol over the https:// endpoint.

Are websockets currently supported?

[derekbekoe]

Yes websockets are supported.
Can you share more information to help us resolve your issue?

[flvcode]

I am running a simple java websocket server locally on port 8080.
My websocket client is postman for testing purposes.

I can connect to ws://localhost:8080 with no issues.
Also I am able to use ngrok for this port but I want to switch to using devtunnels.

For devtunnels I use: wss://TUNNELID-8080.use.devtunnels.ms.
This tunnel has port 8080 set to auto.

Should I explicitly add the wss protocol for port 8080?

When trying to connect over devtunnels, I get the callback for connectionEstablished in my ws server but nothing after that.
No message can be received. Also no callback for closing the ws.
The connection never moves past Connecting in the postman client.

What am I missing?
What other details should I provide to help debug this issue?

Here is my verbose output:

HostSSH: Receiving #23 ChannelOpenMessage(ChannelType: client-ssh-session-stream, SenderChannel: 1)
ClientSSH: SshServerSession:34817906 ConnectAsync
HostSSH: Sending #23 ChannelOpenConfirmationMessage(RecipientChannel: 1)(SenderChannel: 1)
HostSSH: SshClientSession:33592719 OnChannelOpenCompleted(SshChannel(Type: client-ssh-session-stream, Id: 1, RemoteId: 1))
ClientSSH: Sending #0 KeyExchangeInitMessage
HostSSH: Receiving #26 ChannelWindowAdjustMessage(RecipientChannel: 1)(BytesToAdd: 4194343)
HostSSH: Sending #26 ChannelWindowAdjustMessage(RecipientChannel: 1)(BytesToAdd: 4194343)
ClientSSH: Local version: SSH-2.0-Microsoft.DevTunnels.Ssh_3.11, remote version: SSH-2.0-Microsoft.DevTunnels.Ssh_3.11
ClientSSH: Receiving #0 KeyExchangeInitMessage
ClientSSH: KeyExchange negotiation: Server (diffie-hellman-group16-sha512, diffie-hellman-group14-sha256) Client (ecdh-sha2-nistp384, ecdh-sha2-nistp256, diffie-hellman-group16-sha512, diffie-hellman-group14-sha256, ext-info-c) => diffie-hellman-group16-sha512
ClientSSH: PublicKey negotiation: Server (ecdsa-sha2-nistp384) Client (rsa-sha2-512, rsa-sha2-256, ecdsa-sha2-nistp384, ecdsa-sha2-nistp256) => ecdsa-sha2-nistp384
ClientSSH: ClientEncryption negotiation: Server (aes256-cbc, aes256-ctr) Client (aes256-gcm@openssh.com, aes256-cbc, aes256-ctr) => aes256-cbc
ClientSSH: ServerEncryption negotiation: Server (aes256-cbc, aes256-ctr) Client (aes256-gcm@openssh.com, aes256-cbc, aes256-ctr) => aes256-cbc
ClientSSH: ClientHmac negotiation: Server (hmac-sha2-512-etm@openssh.com, hmac-sha2-256-etm@openssh.com, hmac-sha2-512, hmac-sha2-256) Client (hmac-sha2-512-etm@openssh.com, hmac-sha2-256-etm@openssh.com, hmac-sha2-512, hmac-sha2-256) => hmac-sha2-512-etm@openssh.com
ClientSSH: ServerHmac negotiation: Server (hmac-sha2-512-etm@openssh.com, hmac-sha2-256-etm@openssh.com, hmac-sha2-512, hmac-sha2-256) Client (hmac-sha2-512-etm@openssh.com, hmac-sha2-256-etm@openssh.com, hmac-sha2-512, hmac-sha2-256) => hmac-sha2-512-etm@openssh.com
ClientSSH: ClientCompression negotiation: Server (none) Client (none) => none
ClientSSH: ServerCompression negotiation: Server (none) Client (none) => none
ClientSSH: Receiving #1 KeyExchangeDhInitMessage
ClientSSH: Sending #1 KeyExchangeDhReplyMessage
ClientSSH: Sending #2 NewKeysMessage
ClientSSH: Receiving #2 NewKeysMessage
ClientSSH: Sending #3 ExtensionInfoMessage(open-channel-request@microsoft.com; server-sig-algs=rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp256; session-latency@microsoft.com; session-reconnect@microsoft.com)
ClientSSH: SshServerSession:34817906 encrypted
ClientSSH: Receiving #3 ExtensionInfoMessage(open-channel-request@microsoft.com; server-sig-algs=rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp256)
ClientSSH: Receiving #4 ServiceRequestMessage(Service: ssh-userauth)
ClientSSH: Sending #4 ServiceAcceptMessage(Service: ssh-userauth)
ClientSSH: Receiving #5 AuthenticationRequestMessage(Method: none, Username: tunnel)
ClientSSH: SshServerSession:34817906 Authenticating(Username: tunnel, Key: password)
ClientSSH: ClientNone authentication succeeded.
ClientSSH: Sending #5 AuthenticationSuccessMessage
ClientSSH: Sending #6 PortForwardRequestMessage(RequestType: tcpip-forward)(AddressToBind: localhost, Port: 3000)
ClientSSH: Sending #7 PortForwardRequestMessage(RequestType: tcpip-forward)(AddressToBind: localhost, Port: 5500)
ClientSSH: Sending #8 PortForwardRequestMessage(RequestType: tcpip-forward)(AddressToBind: localhost, Port: 8080)
ClientSSH: Receiving #6 SessionRequestSuccessMessage
ClientSSH: Receiving #7 SessionRequestSuccessMessage
ClientSSH: Receiving #8 SessionRequestSuccessMessage
ClientSSH: Receiving #9 ChannelOpenMessage(ChannelType: forwarded-tcpip, SenderChannel: 0)
ClientSSH: PortForwardingService forwarded channel #0 connection to 127.0.0.1:8080.
ClientSSH: Sending #9 ChannelOpenConfirmationMessage(RecipientChannel: 0)(SenderChannel: 0)
ClientSSH: SshServerSession:34817906 OnChannelOpenCompleted(SshChannel(Type: forwarded-tcpip, Id: 0, RemoteId: 0))

[derekbekoe]

Is the tunnel (or the specific port 8080) set to public?

[flvcode]

Yes. Here are my details

% devtunnel show

Tunnel ID             : {TUNNELID}.use

Name                  : 

Description           : 

Tags                  : 

Access control        : {+Anonymous [connect]}

Host connections      : 1

Client connections    : 0

Current upload rate   : 2639 bytes/s (limit: 5 MB/s)

Current download rate : 2415 bytes/s (limit: 5 MB/s)

Upload total          : 88 KB

Download total        : 66 KB

Ports                 : 3

  3000  auto  https://{TUNNELID}-3000.use.devtunnels.ms/  

  5500  auto  https://{TUNNELID}-5500.use.devtunnels.ms/  

  8080  auto  https://{TUNNELID}-8080.use.devtunnels.ms/  

Tunnel Expiration     : 30 days

[flvcode]

Issue got solved without any changes on my end. Also no devtunnels update.

Maybe a network issue solved a reboot.