I have almost the same issue in clustered (3nodes) 1.3.3 version but it is strange that when I click refresh several times, ldap settings appears again and after next few page refresh it disappears. In logs I noticed that when it disappears it shows something like this: 2016-03-17_18:37:18.47394 [error] o.g.r.m.a.LdapSettingsService - Unable to load LDAP settings. 2016-03-17_18:37:18.47396 org.graylog2.restclient.lib.APIException: API call failed GET http://@10.0.0.*202*:12900/system/ldap/settings returned 500 Internal Server Error body: {"type":"ApiError","message":"Null systemPassword"} Other time it refers to http://@10.0.0.*201*:12900. It looks like settings were only written on first node with ip 10.0.0.*200* and works only when server asks this API, when I browse 2 others they include only info;
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