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Try adding dim ctm As CustomTrustManager ctm.InitializeAcceptAll ftpclient.SetCustomSSLTrustManager(ctm)

This error means that the server certificate is not valid or not recognized. Maybe it has expired. Download the attached library (jNet v1.80). It adds an option to use a custom trust manager: Dim trustall As CustomTrustManager trustall.InitializeAcceptAll pop.SetCustomSSLTrustManager(trustall) T
link: doBuild(PKIXValidator.java:387) at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:292) at sun.security.validator.Valid

Dim ws1 As WebSocket Dim cs As CustomTrustManager cs.InitializeAcceptAll ws1.Initialize("ws") ws1.SetCustomSSLTrustManager(cs) Depends on Net library. It will probably won't help in this case.
link: You need to configure the server to support an older version of TLS (TLS v1.0). Have you tried to use a custom trust manager that accepts all certifi

I know that you already switched to a different server. However this issue is solvable by setting a custom trust manager: Dim ctm As CustomTrustManager ctm.InitializeAcceptAll FTP.SetCustomSSLTrustManager(ctm)

Search for the object: https://www.b4x./?query=customtrustmanager The first small link will take you to the library documentation (Net).
link: Hello, where can i find the library for CustomTrustManager.

Is there somerhing similar in b4i to skip the certificate verification? I need it for websockets. Dim ctm As CustomTrustManager ctm.InitializeAcceptAll Client.SetCustomSSLTrustManager(ctm) Thanks for help...
link: Now there is one: https://www.b4x.-to-internal-libraries.48179/#post-558802 WebSocket.SkipCertificateValidation property.
link: :DSuperb, Erel! Thank you very much. It is running excellent!

If you can't change the plain text setting try this: Dim ftp As FTP dim ctm As CustomTrustManager ctm.InitializeAcceptAll ftp.Initialize("FTP", "IP", 21, USER", "PASSWORD") ftp.PassiveMode = True FTP.UseSSL = True FTP.UseSSLExplicit = True FTP.SetCustomSSLTrustManager(ctm) If ftp.IsInitialized=Tru
link: Worth reading: https://www.b4x.com/glossary/ftp/ 1. No need to check whether ftp.IsInitialized. It will always be after you called Initialize. 2. Us

You can use SetCustomSSLTrustManager with CustomTrustManager from the Net library to skip certificate validation. Most probably no.
link: 69003 I did not find enough documentation to create a TrustManager object, unfortunatey; but I found this question and the answer (but for B4i): Q)
link: I have a b4j websocket server certainly reachable from outside my network (I mean that I don't have problems with ports, firewalls, ...). I created t

I can't test it right now. Does this help me? Sub As JavaObject Dim tm As CustomTrustManager tm.InitializeAcceptAll Dim SSLContext As JavaObject SSLContext = SSLContext.InitializeStatic("javax.net.ssl.SSLContext").RunMethod("getInstance", Array("TLS")) SSLContext.RunMethod("init", A

You are testing it with a non-trusted certificate, right? You should test it with the accept all CustomTrustManager.
link: Sub Class_Globals Private fx As JFX Private ftp As FTP Private sftp As SFtp Private ctm As CustomTrustManager Private ftpUser
link: Yes you are correct, I am testing with untrusted self signed cert.. here is my updated code: Sub Class_Globals Private fx As JFX Private ftp

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