LDAP is not working for Bigbang Apps behind the istio

Description

I have deployed Bigbang Release 1.25.1. I have a LDAP server (FreeIPA) outside of the kubernetes cluster. I am trying to setup LDAP integration for Bigbang apps. Istio does not seem to support LDAP protocol. I get unable to open LDAP connection error from the pods. Are there any docs on how to setup LDAP integration for Bigbang Apps or if LDAP is supported option?

Below are the logs from Bigbang Sonarqube pod. Keycloak integration works as it is over https

INFO  web[][o.s.a.l.LdapContextFactory] Test LDAP connection: FAIL
ERROR web[][o.s.s.p.Platform] Background initialization failed. Stopping SonarQube
org.sonar.api.utils.SonarException: Security realm fails to start: Unable to open LDAP connection
	at org.sonar.server.user.SecurityRealmFactory.start(SecurityRealmFactory.java:93)
	at org.sonar.core.platform.StartableCloseableSafeLifecyleStrategy.start(StartableCloseableSafeLifecyleStrategy.java:40)
	at org.picocontainer.injectors.AbstractInjectionFactory$LifecycleAdapter.start(AbstractInjectionFactory.java:84)
	at org.picocontainer.behaviors.AbstractBehavior.start(AbstractBehavior.java:169)
	at org.picocontainer.behaviors.Stored$RealComponentLifecycle.start(Stored.java:132)
	at org.picocontainer.behaviors.Stored.start(Stored.java:110)
	at org.picocontainer.DefaultPicoContainer.potentiallyStartAdapter(DefaultPicoContainer.java:1016)
	at org.picocontainer.DefaultPicoContainer.startAdapters(DefaultPicoContainer.java:1009)
	at org.picocontainer.DefaultPicoContainer.start(DefaultPicoContainer.java:767)
	at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:136)
	at org.sonar.server.platform.platformlevel.PlatformLevel.start(PlatformLevel.java:90)
	at org.sonar.server.platform.platformlevel.PlatformLevel4.start(PlatformLevel4.java:581)
	at org.sonar.server.platform.PlatformImpl.start(PlatformImpl.java:213)
	at org.sonar.server.platform.PlatformImpl.startLevel34Containers(PlatformImpl.java:187)
	at org.sonar.server.platform.PlatformImpl.access$500(PlatformImpl.java:46)
	at org.sonar.server.platform.PlatformImpl$1.lambda$doRun$0(PlatformImpl.java:120)
	at org.sonar.server.platform.PlatformImpl$AutoStarterRunnable.runIfNotAborted(PlatformImpl.java:370)
	at org.sonar.server.platform.PlatformImpl$1.doRun(PlatformImpl.java:120)
	at org.sonar.server.platform.PlatformImpl$AutoStarterRunnable.run(PlatformImpl.java:354)
	at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: org.sonar.auth.ldap.LdapException: Unable to open LDAP connection
	at org.sonar.auth.ldap.LdapContextFactory.testConnection(LdapContextFactory.java:214)
	at org.sonar.auth.ldap.LdapRealm.init(LdapRealm.java:63)
	at org.sonar.server.user.SecurityRealmFactory.start(SecurityRealmFactory.java:87)
	... 19 common frames omitted
Caused by: javax.naming.CommunicationException: simple bind failed: freeipa.dummy.io:636
	at java.naming/com.sun.jndi.ldap.LdapClient.authenticate(LdapClient.java:219)
	at java.naming/com.sun.jndi.ldap.LdapCtx.connect(LdapCtx.java:2895)
	at java.naming/com.sun.jndi.ldap.LdapCtx.<init>(LdapCtx.java:348)
	at java.naming/com.sun.jndi.ldap.LdapCtxFactory.getLdapCtxFromUrl(LdapCtxFactory.java:262)
	at java.naming/com.sun.jndi.ldap.LdapCtxFactory.getUsingURL(LdapCtxFactory.java:226)
	at java.naming/com.sun.jndi.ldap.LdapCtxFactory.getUsingURLs(LdapCtxFactory.java:280)
	at java.naming/com.sun.jndi.ldap.LdapCtxFactory.getLdapCtxInstance(LdapCtxFactory.java:185)
	at java.naming/com.sun.jndi.ldap.LdapCtxFactory.getInitialContext(LdapCtxFactory.java:115)
	at java.naming/javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:730)
	at java.naming/javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:305)
	at java.naming/javax.naming.InitialContext.init(InitialContext.java:236)
	at java.naming/javax.naming.ldap.InitialLdapContext.<init>(InitialLdapContext.java:154)
	at org.sonar.auth.ldap.LdapContextFactory.createInitialDirContext(LdapContextFactory.java:137)
	at org.sonar.auth.ldap.LdapContextFactory.createBindContext(LdapContextFactory.java:95)
	at org.sonar.auth.ldap.LdapContextFactory.testConnection(LdapContextFactory.java:210)
	... 21 common frames omitted
Caused by: java.net.SocketException: Connection or outbound has closed
	at java.base/sun.security.ssl.SSLSocketImpl$AppOutputStream.write(SSLSocketImpl.java:1217)
	at java.base/java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:81)
	at java.base/java.io.BufferedOutputStream.flush(BufferedOutputStream.java:142)
	at java.naming/com.sun.jndi.ldap.Connection.writeRequest(Connection.java:414)
	at java.naming/com.sun.jndi.ldap.Connection.writeRequest(Connection.java:387)
	at java.naming/com.sun.jndi.ldap.LdapClient.ldapBind(LdapClient.java:359)
	at java.naming/com.sun.jndi.ldap.LdapClient.authenticate(LdapClient.java:214)
	... 35 common frames omitted