Schemus Mail Configuration hanging on Loading

I was configuring the Schemus Mail Configuration tool to synchronise recipient information from an Active Directory forest to Symantec Cloud but ran into an issue with the Synchronisation tool.

I entered the configuration for an Active Directory domain controller into the tool along with a username and password as follows:

When clicking next the wizard would get stuck on Loading and not progress any further.

After clicking cancel and closing the wizard then selecting View --> Logs I noticed multiple entries of "Cannot access the LDAP server. Malformed reply from SOCKS server"

 

Can't access the LDAP server. Malformed reply from SOCKS server

com.metanate.schemus.data.source.SourceException: Malformed reply from SOCKS server
 at com.metanate.schemus.data.source.LdapSource.setContext(Unknown Source)
 at com.metanate.schemus.data.source.LdapSource.ensureOpen(Unknown Source)
 at com.metanate.schemus.data.source.LdapSource.getSearchBases(Unknown Source)
 at com.metanate.schemus.config.gui.wizard.swing.source.SearchSettingsPanel$2.construct(Unknown Source)
 at com.metanate.schemus.config.gui.wizard.swing.SwingWorker$2.run(Unknown Source)
 at java.lang.Thread.run(Unknown Source)
Caused by: javax.naming.CommunicationException: 10.100.8.91:389 [Root exception is java.net.SocketException: Malformed reply from SOCKS server]
 at com.sun.jndi.ldap.Connection.(Unknown Source)
 at com.sun.jndi.ldap.LdapClient.(Unknown Source)
 at com.sun.jndi.ldap.LdapClient.getInstance(Unknown Source)
 at com.sun.jndi.ldap.LdapCtx.connect(Unknown Source)
 at com.sun.jndi.ldap.LdapCtx.(Unknown Source)
 at com.sun.jndi.ldap.LdapCtxFactory.getUsingURL(Unknown Source)
 at com.sun.jndi.ldap.LdapCtxFactory.getUsingURLs(Unknown Source)
 at com.sun.jndi.ldap.LdapCtxFactory.getLdapCtxInstance(Unknown Source)
 at com.sun.jndi.ldap.LdapCtxFactory.getInitialContext(Unknown Source)
 at javax.naming.spi.NamingManager.getInitialContext(Unknown Source)
 at javax.naming.InitialContext.getDefaultInitCtx(Unknown Source)
 at javax.naming.InitialContext.init(Unknown Source)
 at javax.naming.ldap.InitialLdapContext.(Unknown Source)
 ... 6 more
Caused by: java.net.SocketException: Malformed reply from SOCKS server
 at java.net.SocksSocketImpl.readSocksReply(Unknown Source)
 at java.net.SocksSocketImpl.connect(Unknown Source)
 at java.net.Socket.connect(Unknown Source)
 at java.net.Socket.connect(Unknown Source)
 at java.net.Socket.(Unknown Source)
 at java.net.Socket.(Unknown Source)
 at com.sun.jndi.ldap.Connection.createSocket(Unknown Source)

 

SOCKS is a proxy technology.  After checking Internet Options it turns out that a proxy server was configured on the server.

Removing the proxy server from Internet Options resolved the problem.