login process hangs if shiro.ini is misconfigured

ldapRealm = com.sos.auth.shiro.SOSLdapAuthorizingRealm
ldapRealm.userDnTemplate = uid={0},dc=example,dc=com
ldapRealm.searchBase = dc=example,dc=com
ldapRealm.contextFactory.url = ldap://ldap.forumsys.com:389

#ldapRealm.groupNameAttribute=ou
#ldapRealm.userNameAttribute=uid
#ldapRealm.userSearchFilter=(cn=%s)
 
# Mapping of a LDAP group to roles. You can assign more than one role with separator sign |
#ldapRealm.groupRolesMap = \
#"scientists":"it_operator", \
#"mathematicians":"administrator|application_manager"
 
#rolePermissionResolver = com.sos.auth.shiro.SOSPermissionResolverAdapter
#rolePermissionResolver.ini = $iniRealm
#ldapRealm.rolePermissionResolver = $rolePermissionResolver
 
#securityManager.realms = $ldapRealm
#cacheManager = org.apache.shiro.cache.MemoryConstrainedCacheManager
#securityManager.cacheManager = $cacheManager

2017-08-02 10:23:31,269 INFO  tp1174290147-466 o.a.s.r.AuthorizingRealm                     - No cache or cacheManager properties have been set.  Authorization cache cannot be obtained.
2017-08-02 10:23:31,474 ERROR tp1174290147-466 c.s.a.s.SOSLdapAuthorizing                   - javax.naming.AuthenticationException: [LDAP: error code 49 - Invalid Credentials]
2017-08-02 10:23:31,475 INFO  tp1174290147-466 c.s.j.c.JocCockpitProperties                 - Resolved path of shiro.ini = C:/ProgramData/sos-berlin.com/joc/jetty_base/resources/joc/shiro.ini