Lucee - MySQL - Could not create connection to database server. Attempted reconnect 3 times. Giving up

I try to add a new data source, but I get this error:

lucee.runtime.exp.NativeException: Could not create connection to database server. Attempted reconnect 3 times. Giving up. at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:110) at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97) at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:89) at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:63) at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:73) at com.mysql.cj.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:898) at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:823) at com.mysql.cj.jdbc.ConnectionImpl.(ConnectionImpl.java:448) at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:241) at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:198) at lucee.runtime.db.DataSourceSupport._getConnection(DataSourceSupport.java:135) at lucee.runtime.db.DataSourceSupport.getConnection(DataSourceSupport.java:103) at lucee.runtime.tag.Admin._doVerifyDatasource(Admin.java:2936) at lucee.runtime.tag.Admin.doUpdateDatasource(Admin.java:2712) at lucee.runtime.tag.Admin._doStartTag(Admin.java:742) at lucee.runtime.tag.Admin.doStartTag(Admin.java:355) at services_datasource_create_cfm1334$cf.call(/admin/services.datasource.create.cfm:88) at lucee.runtime.PageContextImpl._doInclude(PageContextImpl.java:1015) at lucee.runtime.PageContextImpl._doInclude(PageContextImpl.java:938) at lucee.runtime.PageContextImpl.doInclude(PageContextImpl.java:919) at services_datasource_cfm414$cf.call(/admin/services.datasource.cfm:108) at lucee.runtime.PageContextImpl._doInclude(PageContextImpl.java:1015) at lucee.runtime.PageContextImpl._doInclude(PageContextImpl.java:938) at lucee.runtime.PageContextImpl.doInclude(PageContextImpl.java:919) at web_cfm$cf.call(/admin/web.cfm:492) at lucee.runtime.PageContextImpl._doInclude(PageContextImpl.java:1015) at lucee.runtime.PageContextImpl._doInclude(PageContextImpl.java:938) at lucee.runtime.PageContextImpl.doInclude(PageContextImpl.java:919) at server_cfm$cf.call(/admin/server.cfm:2) at lucee.runtime.PageContextImpl._doInclude(PageContextImpl.java:1015) at lucee.runtime.PageContextImpl._doInclude(PageContextImpl.java:938) at lucee.runtime.listener.ModernAppListener._onRequest(ModernAppListener.java:219) at lucee.runtime.listener.MixedAppListener.onRequest(MixedAppListener.java:44) at lucee.runtime.PageContextImpl.execute(PageContextImpl.java:2482) at lucee.runtime.PageContextImpl._execute(PageContextImpl.java:2468) at lucee.runtime.PageContextImpl.executeCFML(PageContextImpl.java:2439) at lucee.runtime.engine.Request.exe(Request.java:45) at lucee.runtime.engine.CFMLEngineImpl._service(CFMLEngineImpl.java:1198) at lucee.runtime.engine.CFMLEngineImpl.serviceCFML(CFMLEngineImpl.java:1144) at lucee.loader.engine.CFMLEngineWrapper.serviceCFML(CFMLEngineWrapper.java:97) at lucee.loader.servlet.CFMLServlet.service(CFMLServlet.java:51) at javax.servlet.http.HttpServlet.service(HttpServlet.java:764) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) at mod_cfml.core.invoke(core.java:180) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:687) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:360) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:399) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:890) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1789) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.base/java.lang.Thread.run(Unknown Source) Caused by: java.sql.SQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up. ... 65 more Caused by: com.mysql.cj.exceptions.CJCommunicationsException: Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server. at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) at java.base/java.lang.reflect.Constructor.newInstance(Unknown Source) at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:61) at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:105) at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:151) at com.mysql.cj.exceptions.ExceptionFactory.createCommunicationsException(ExceptionFactory.java:167) at com.mysql.cj.protocol.a.NativeSocketConnection.connect(NativeSocketConnection.java:89) at com.mysql.cj.NativeSession.connect(NativeSession.java:120) at com.mysql.cj.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:842) ... 59 more Caused by: java.net.ConnectException: Verbindungsaufbau abgelehnt (Connection refused) at java.base/java.net.PlainSocketImpl.socketConnect(Native Method) at java.base/java.net.AbstractPlainSocketImpl.doConnect(Unknown Source) at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source) at java.base/java.net.AbstractPlainSocketImpl.connect(Unknown Source) at java.base/java.net.SocksSocketImpl.connect(Unknown Source) at java.base/java.net.Socket.connect(Unknown Source) at com.mysql.cj.protocol.StandardSocketFactory.connect(StandardSocketFactory.java:153) at com.mysql.cj.protocol.a.NativeSocketConnection.connect(NativeSocketConnection.java:63) ... 61 mor

My settings:

My first suggestion would be to determine if the Lucee server can even talk to that other server. If you have RDP or shell access, I'd test with a ping. If that's successful, I'd start looking at the port. Finally, make sure the MySQL actually allows your Lucee server IP to connect. In fact, I'd check that first.