RAMSession Exception - Credentials cannot be supplied for NTLM Authentication

I'm trying to create a RAM Session object from a Java client program using the following code:

RAMSession mySession = new RAMSession(https://server.com/ram.ws, "MyUserName", "MyPassword");
	

and I'm getting the following exception:

- Credentials cannot be used for NTLM authentication: org.apache.commons.httpclient.UsernamePasswordCredentials
org.apache.commons.httpclient.auth.InvalidCredentialsException: Credentials cannot be used for NTLM authentication: org.apache.commons.httpclient.UsernamePasswordCredentials
 at org.apache.commons.httpclient.auth.NTLMScheme.authenticate(NTLMScheme.java:331)
 at org.apache.commons.httpclient.HttpMethodDirector.authenticateHost(HttpMethodDirector.java:281)
 at org.apache.commons.httpclient.HttpMethodDirector.authenticate(HttpMethodDirector.java:233)
 at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:169)
 at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:396)
 at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:324)
 at com.ibm.ram.internal.client.RAMClient$4.executeMethod(RAMClient.java:1332)
 at com.ibm.ram.internal.client.RAMClient.getRepositoryInformation(RAMClient.java:110)
 at com.ibm.ram.internal.client.RAMClient.initialize(RAMClient.java:259)
 at com.ibm.ram.client.RAMSession.createClient(RAMSession.java:344)
 at com.ibm.ram.client.RAMSession.<init>(RAMSession.java:309)
 at com.ibm.ram.client.RAMSession.<init>(RAMSession.java:282)
 at RAMTest.main(RAMTest.java:10)

I can type the URL https://server.com/ram.ws into a browser and get to the my RAM home page and can log in with the credentials "MyUserName" and "MyPassword".  If I don't supply the username and password, the RAMSession object gets created, but no results are returned when I call functions to get all of the communities associated with the repository, even though it contains multiple communities.