Login latency seen with LDAP Authentication
ProblemUsers notice a latency at login when they are authenticated using LDAP.
Symptoms
If you review the stack trace for the login, you will see the following, indicating we are stuck executing the call getHostByAddr:
main,Default-thread-14,5,attrs=(session_id=B67EF8A2B06739C031D014FC588414CF)
java.net.Inet6AddressImpl.getHostByAddr(Native Method)
java.net.InetAddress$1.getHostByAddr(InetAddress.java:880)
java.net.InetAddress.getHostFromNameService(InetAddress.java:559)
java.net.InetAddress.getHostName(InetAddress.java:502)
java.net.InetAddress.getHostName(InetAddress.java:474)
com.sun.net.ssl.internal.ssl.SSLSocketImpl.getHost(SSLSocketImpl.java:1956)
com.sun.net.ssl.internal.ssl.Handshaker.getHostSE(Handshaker.java:257)
com.sun.net.ssl.internal.ssl.ClientHandshaker.getKickstartMessage(ClientHandshaker.java:1023)
com.sun.net.ssl.internal.ssl.Handshaker.kickstart(Handshaker.java:620)
com.sun.net.ssl.internal.ssl.SSLSocketImpl.kickstartHandshake(SSLSocketImpl.java:1290)
com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1187)
com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1215)
com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1199)
com.sun.jndi.ldap.Connection.createSocket(Connection.java:364)
com.sun.jndi.ldap.Connection.(Connection.java:186)
com.sun.jndi.ldap.LdapClient.(LdapClient.java:116)
Cause
LDAP authentication requires reverse DNS to be set up. If there is no externally accessible reverse DNS lookup, a delay is seen in authenticating the user.
LDAP authentication requires reverse DNS to be set up. If there is no externally accessible reverse DNS lookup, a delay is seen in authenticating the user.
Resolution
Reverse DNS lookup needs to be set up on the LDAP server and should be externally accessible.
Reverse DNS lookup needs to be set up on the LDAP server and should be externally accessible.