8.1.0 fails to connect to FTP-SSL (Explicit Auth TLS) server, 8.0.2 and Filezilla work

[vlasbaard]

Clicking Network Diagnostics doesn't seem to do anything.

This is in 8.1.0 - the same configuration works in 8.0.2, and in Filezilla.

Regular FTP (with otherwise identical configuration) works in 8.1.0 as well.

Not sure if there is a log somewhere where I can paste things from?

OS: macOS 12.0.1 (Intel)
(Private) FTP server: PureFTPd with a Let's Encrypt certificate

[jSeird]

Same here.
Also since 8.1.0 (36410) connection to FTPS fails with the following error randomly:

OS is also macOS 12.0.1 (Intel)
The host is proFTPd with a valid SSL. Connection via other FTP Clients or older Version of Cyberduck are working just fine.

[AliveDevil]

Debug Log output can be retrieved by opening up Cyberduck preferences, switching to the Connection-tab and enabling Debug Logging.
The log file can be revealed by clicking on Show, after reproducing the error.
If the file is not revealed, it can be found at:

• ~/Library/Logs/Cyberduck on macOS
• %AppData%\Cyberduck on Windows

[AliveDevil]

There hasn't been any change since 8.0.1.

The only difference is that macOS Java runtime has been updated from JDK 15 to JDK 17.

[vlasbaard]

Ok, got a relevant log. (Note I replaced user-/hostnames/IPs).

As far as my knowledge on the subject allows, the line where the trouble starts is after MLSD:

2021-11-30 20:30:44,829 [Thread-39] WARN  ch.cyberduck.core.ftp.FTPClient - Unable to make field private final sun.security.util.Cache sun.security.ssl.SSLSessionContextImpl.sessionHostPortCache accessible: module java.base does not "opens sun.security.ssl" to unnamed module @21507a04