[NET-718] "Unsupported or unrecognized SSL message" for FTPS via proxy

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 3.9.0
• Assignee: Unassigned
• Reporter: Sebastian Alfers
• Created: 07/Mar/23 11:02
• Updated: 03/Jun/24 13:18

Description

After bumping from commons-net 3.8 to 3.9, we started to see this error.

I happens only when using FTPS via a proxy, and it is likely that this change may have introduced. 

 

Any recommendation how to bring back the pre-3.9 behavior? This is the full stacktrace:

Start of log messages of test that failed with assertion failed: fishForMessage(OnNext(_) or OnComplete) found unexpected message OnError(javax.net.ssl.SSLException: Unsupported or unrecognized SSL message
    at java.base/sun.security.ssl.SSLSocketInputRecord.handleUnknownRecord(SSLSocketInputRecord.java:451)
    at java.base/sun.security.ssl.SSLSocketInputRecord.decode(SSLSocketInputRecord.java:175)
    at java.base/sun.security.ssl.SSLTransport.decode(SSLTransport.java:111)
    at java.base/sun.security.ssl.SSLSocketImpl.decode(SSLSocketImpl.java:1505)
    at java.base/sun.security.ssl.SSLSocketImpl.readHandshakeRecord(SSLSocketImpl.java:1420)
    at java.base/sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:455)
    at java.base/sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:426)
    at org.apache.commons.net.ftp.FTPSClient.openDataConnection(FTPSClient.java:278)
    at org.apache.commons.net.ftp.FTPClient._retrieveFileStream(FTPClient.java:915)
    at org.apache.commons.net.ftp.FTPClient.retrieveFileStream(FTPClient.java:2841)
    at akka.stream.alpakka.ftp.impl.CommonFtpOperations.$anonfun$retrieveFileInputStream$1(CommonFtpOperations.scala:71)
    at scala.util.Try$.apply(Try.scala:210) 

 

 

 

 

Issue Links

• is related to: NET-731 FTPSClient no longer supports fileTransferMode (eg DEFLATE)
• is related to: NET-726 Add protected getters to FTPSClient
• relates to: NET-642 FTPSClient execPROT removes proxy settings