InitialDirContext Throwing ServiceUnavailableException socket closed
Any assistance is appreciated.
Problems occurring when multiple DirContext instances are created. Attempting to make a SSL connection to Active Directory on port 636. A single successful context can be established in the below code.However, a second instantiation of InitialDirContext(env) results in a javax.naming.ServiceUnavailableException: [domain]:636; socket closed error. Multiple contexts are desired to establish a connection pool.
A few items to note. Establishing four unsecure DirContext on port 389 works successfully. I can establish a DirContext on port 636, use the context, close the context then establish new contexts without a problem. A server certificate was imported to the C:\j2sdk1.4.2_11\jre\lib\security\cacerts file. Testing on a local computer. Below is sample code:
publicstaticvoid main(String[] args){
try{
System.setProperty("javax.net.debug","all");
// Set up the environment for creating the initial context
Hashtable env =new Hashtable();
env.put(Context.INITIAL_CONTEXT_FACTORY,"com.sun.jndi.ldap.LdapCtxFactory");
env.put(Context.SECURITY_PRINCIPAL,"[USER DN]");
env.put(Context.SECURITY_CREDENTIALS,"[PWD]");
//NON SSL
//env.put(Context.PROVIDER_URL, "ldap://[server]:389");
//SSL
env.put(Context.PROVIDER_URL,"ldap://[server]:636");
env.put(Context.SECURITY_PROTOCOL,"ssl");
env.put(Context.SECURITY_AUTHENTICATION,"simple");
// Create the initial context
DirContext ctx =null;
DirContext ctx2 =null;
DirContext ctx3 =null;
DirContext ctx4 =null;
try{
//Works every time...
ctx =new InitialDirContext(env);
}catch (NamingException e){
e.printStackTrace();
}
try{
//Fails on port 636, works on port 389
ctx2 =new InitialDirContext(env);
}catch (NamingException e){
e.printStackTrace();
}
try{
//Works on port 636 (after 2nd attempt fails) and port 389
ctx3 =new InitialDirContext(env);
}catch (NamingException e){
e.printStackTrace();
}
try{
//Fails on port 636, works on port 389
ctx4 =new InitialDirContext(env);
}catch (NamingException e){
e.printStackTrace();
}
Attributes attrs = ctx.getAttributes("[A USER DN]");
System.out.println("Total attributes returned: " + attrs.size());
try{
ctx.close();
ctx2.close();
ctx3.close();
ctx4.close();
}catch (NamingException e){
e.printStackTrace();
}
}catch (Exception ex){
ex.printStackTrace();
}
System.exit(0);
}
The java debug statements at the second exception:
Thread-1, WRITE: TLSv1 Handshake, length = 121
Thread-1, received EOFException: ignored
Thread-1, called closeInternal(false)
Thread-1, SEND TLSv1 ALERT: warning, description = close_notify
Plaintext before ENCRYPTION: len = 18
0000: 01 00 0F 78 84 EE 16 24F6 99 B0 83 52 14 FF 86 ...x...$....R...
0010: 29 3C )<
Thread-1, WRITE: TLSv1 Alert, length = 18
Thread-1, called close()
Thread-1, called closeInternal(true)
Again, any assistance is appreciated.
