SlaveOK reads against SCCC config server fail with error "all servers down/unreachable when querying"

mongos> use config;

switched to db config

mongos> db.getMongo().setReadPref('secondaryPreferred')

mongos> db.chunks.count()

2017-02-03T14:26:42.603-0500 E QUERY    [thread1] Error: count failed: {

        "code" : 6,

        "ok" : 0,

        "errmsg" : "all servers down/unreachable when querying: kaloianmdesktop:20002,kaloianmdesktop:20003,kaloianmdesktop:20004"

} :

_getErrorWithCode@src/mongo/shell/utils.js:25:13

DBQuery.prototype.count@src/mongo/shell/query.js:383:11

DBCollection.prototype.count@src/mongo/shell/collection.js:1700:12

@(shell):1:1

2017-01-31T07:28:40.004+0000 I NETWORK  [conn4] query on admin.$cmd: { query: "1", help: 1 } failed to: in.dbcfg1.mydomain.com:27019 (10.0.97.139) exception: "query" had the wrong type. Expected Object, found String

2017-01-31T07:28:40.004+0000 I NETWORK  [conn4] query on admin.$cmd: { query: "1", help: 1 } failed to: in.dbcfg2.mydomain.com:27019 (10.0.97.140) exception: "query" had the wrong type. Expected Object, found String

2017-01-31T07:28:40.004+0000 I NETWORK  [conn4] query on admin.$cmd: { query: "1", help: 1 } failed to: in.dbcfg3.mydomain.com:27019 (10.0.97.141) exception: "query" had the wrong type. Expected Object, found String

2017-01-31T07:28:40.004+0000 W NETWORK  [conn4] db exception when initializing on config, current connection state is { state: { conn: "SyncClusterConnection  [in.dbcfg1.mydomain.com:27019 (10.0.97.139),in.dbcfg2.mydomain.com:27019 (10.0.97.140),in.dbcfg3.mydomain.com:27019 (10.0.97.141)]", vinfo: "config:in.dbcfg1.mydomain.com:27019,in.dbcfg2.mydomain.com:27019,in.dbcfg3.mydomain.com:27019", cursor: "(empty)", count: 0, done: false }, retryNext: false, init: false, finish: false, errored: false } :: caused by :: 6 all servers down/unreachable when querying: in.dbcfg1.mydomain.com:27019,in.dbcfg2.mydomain.com:27019,in.dbcfg3.mydomain.com:27019