After updating to 1.5.4, guacd fails to connect with an "SSL accept failed" error.

[tanakakz <ta...@alpha.co.jp>]

Dear Team,

I'm using ssl with guacd.
After updating guacamole from 1.5.1 to 1.5.4, the following error will be displayed within 1-2 days after startup and connection will not be possible.

"Unable to set up SSL/TLS: SSL accept failed"

Guacamole client prints the following errors:

"ERROR o.a.g.w.GuacamoleWebSocketTunnelEndpoint - Creation of WebSocket tunnel to guacd failed: javax.net.ssl.SSLException: Received fatal alert: internal_error"
"ERROR o.a.g.s.GuacamoleHTTPTunnelServlet - HTTP tunnel request failed: javax.net.ssl.SSLException: Received fatal alert: internal_error"

Restarting guacd temporarily resolves the error, but the error reoccurs over time.
Guacd may be the cause of the problem, as restarting only guacd resolves the issue.

I'm using settings and certificates that worked fine in 1.5.1.
I'm running two servers, one of which had its SSL cert updated with a guacd update, but the same issue occurs on both the server I didn't update the SSL cert on and the server I updated it on.
I can connect without any problems immediately after starting guacd, so I don't think it's a problem with the SSL certificate.
Were there any SSL changes in guacd between 1.5.1 and 1.5.4?

50-100 users connect to the server every day. It is unclear whether this problem occurs over time or depending on the total number of connections.

My server's OS and version are as follows.

OS: Ubuntu 22.04.3 LTS
guacd: 1.5.4
Guacamole Client: 1.5.4

Best Regard,
Kazuhiko

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