B4J Question problem B4J POP3 SMTP

[fransvlaarhoven]

Hello,

- I'm trying to connect to a mailserver using POP3 SSL port 995
- connecting to this mailserver using POP3 unencrypted port 110 works fine.
- connecting to this mailserver using POP3 SSL port 995 using Thunderbird also works fine.
- connecting to this mailserver using POP3 unencrypted port 110 works fine.

- I'm using B4J version 5.90 and jNet version 1.21

- I'm using SSL-certificate from Comodo
- this certificate is also used for the (jetty)server in the same application and making SSL-connections to this server works fine.
- the same certificates used for the configuration of the server are also installed in the default keystore of JRE (lib\security\cacerts)


However, when running the program, I still see the following error:

sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

I suppose I'm doing something wrong but I've no clue what....

 

[Erel]

Based on the error message the certificate is not recognized. As the certificate itself works with jServer then the problem is somewhere else.

Check the mail server configuration.

 

[fransvlaarhoven]

Based on the error message the certificate is not recognized. As the certificate itself works with jServer then the problem is somewhere else.

Check the mail server configuration.

The mailserver configuration is correct: the mailserver is running and the SSL-pop3-port can be used from the outside using an external mail-client.
Futhermore, if the problem was with the configuration of the mailserver, it would be the mailserver generating errors and not the B4J-application.

Question: Jserver is configured using SslConfiguration in the B4J-application. Is something like that also needed for POP3 or is JRE retrieving the keys from the default java keystore?

 

[Erel]

Jserver is configured using SslConfiguration in the B4J-application. Is something like that also needed for POP3 or is JRE retrieving the keys from the default java keystore?

No. Only the server side requires this configuration.


Try it with a B4A program. Does it work?

 

[fransvlaarhoven]

writing the most basic B4A program for testing pop3 on the mailserver, listmessages also generates the following error:

java.security.cert.CertPathValidatorException: Trust anchor for certification path not found.

But, contacting the same mailserver with thunderbird and downloading messages with pop3 from the same account works perfect!

Strange to say the least...

 

[Erel]

But, contacting the same mailserver with thunderbird and downloading messages with pop3 from the same account works perfect!

It probably ignores this error.

 

[fransvlaarhoven]

It probably ignores this error.

Indeed, it seems to be a problem with the mailserver:

- using hMail as a mailserver generates this error.
- using Linux/postfix as a mailserver gives no errors.