c# - Error with Mongo Client -

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when try connected mongo server mongo client, following warning:

error while trying show server startup warnings: no such cmd

it still gives me access , can access database. issue when try accessing db c#. warning throws exception, , application terminates.

the mongod command used 

mongod --port 30000

no startup scripts far can tell.

the mongo server running on debian, on machine.

update

the error thrown .net is

unable connect server xxx.xxx.xxx.xx:30000: command 'ping' failed: no such cmd (response: { "errmsg" : "no such cmd", "bad cmd" : { "ping" : 1 }, "ok" : 0.0 }).

solved. server version older client version.


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