See java source file for more information.
Written by Steven Maser, Talend (Spring/Summer 2020, updated Spring 2021)
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GET Latest build:  https://s3-us-west-2.amazonaws.com/smaser.talend.com/SHARE/TestConnectivity.jar

For a list of ALL URLs, by Talend Cloud Region, use Talend Help located here:  https://help.talend.com/reader/xy22F7B8FHBh12uQzE1Tqg/mHZWs1Mvk5nOZtZIxJa3SA
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Sample commands:

java -jar TestConnectivity.jar
java -jar TestConnectivity.jar HELP
java -jar TestConnectivity.jar DEBUG
java -jar TestConnectivity.jar NOCLOUD
java -jar TestConnectivity.jar NOCLOUD NOESB
java -jar TestConnectivity.jar US
java -jar TestConnectivity.jar EU
java -jar TestConnectivity.jar AP
java -jar TestConnectivity.jar URL http://mywebserver.com/
java -jar TestConnectivity.jar DEBUG URL http://mywebserver.com/  ftp://speedtest.tele2.net/

java -Dhttps.proxyHost=10.10.10.1 -Dhttps.proxyPort=8080 -Dhttps.proxyUser=myname -Dhttps.proxyPassword=secret -jar TestConnectivity.jar

java -Dhttps.proxyHost=10.10.10.1 -Dhttps.proxyPort=8080 -Dhttps.proxyUser=myname -Dhttps.proxyPassword=secret -jar TestConnectivity.jar DEBUG http://myhost:8080/

Java Debug Settings you can try too:
-Djava.security.debug=certpath
-Djavax.net.debug=ssl


To write to a file, add this to the end of your command:
   >testConnectivity.log

******************** TYPICAL PARAMETERS CAN INCLUDE(you may choose to use your JRE's cacerts file) *****************************************************
-Dhttps.proxySet=true
-Dhttps.proxyHost=MYPROXYHOST
-Dhttps.proxyPort=9090
-Dhttps.proxyUser=ME
-Dhttps.proxyPassword=MYPASSWORD
-Dhttps.nonProxyHosts=127.0.0.1|localhost|*.MYCOMPANY.com
-Djavax.net.ssl.trustStoreType=JKS
-Djavax.net.ssl.trustStore="C:/certs/cacerts"
-Djavax.net.ssl.trustStorePassword="changeit"
-Djavax.net.ssl.keyStoreType=JKS
-Djavax.net.ssl.keyStore="C:/certs/cacerts"
-Djavax.net.ssl.keyStorePassword="changeit" 
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TALEND DEBUG
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1. Add the lines below at the end of the file Talend-Studio-win-x86_64.exe.ini

-Djava.security.debug=certpath
-Djavax.net.debug=ssl
-Dorg.apache.commons.logging.Log=org.apache.commons.logging.impl.SimpleLog
-Dorg.apache.commons.logging.simplelog.showdatetime=true
-Dorg.apache.commons.logging.simplelog.log.org.apache.http.impl.conn=DEBUG
-Dorg.apache.commons.logging.simplelog.log.org.apache.http.impl.client=DEBUG
-Dorg.apache.commons.logging.simplelog.log.org.apache.http.client=DEBUG

2- Open a terminal (cmd.exe) and go in Studio installation folder.

3- Start Studio with option :
Talend-Studio-win-x86_64.exe --talendDebug > debug_ssl.txt 2>&1


4. Reproduce the issue , then collect the file debug_ssl.txt

****************************************  SSL Certificate Extractor ***************************************
java -jar SSLCertificateExtractor.jar --connect us.cloud.talend.com:443 
https://s3-us-west-2.amazonaws.com/smaser.talend.com/SHARE/SSLCertificateExtractor.jar

keytool -list -keystore $JAVA_HOME/lib/security/cacerts
PKIX Errors --> Certificates
Make sure you have a recent Java installation:  "If the endpoint has a certificate signed by a known CA (not self-signed) and you have a relatively recent version of the JDK, everything should work without requiring any imports on your side."
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