We are unable to create a connection from our web server to our DB server using a connection string in any of the formats below:

mongodb://XXXUSERXXX:XXXPASSWORDXXX@T02-VM-XXXX01.vss-eng.com,XXXUSERXXX:XXXPASSWORDXXX@T02-VM-XXXX02.vss-eng.com,XXXUSERXXX:XXXPASSWORDXXX@T02-VM-XXXX03.vss-eng.com/NH_DEVICEDATA?replicaSet=NH_Data_01

mongodb://XXXUSERXXX:XXXPASSWORDXXX@ T02-VM-XXXX01.vss-eng.com:27017, T02-VM-XXXX02.vss-eng.com:27017/NH_DEVICEDATA
mongodb://XXXUSERXXX:XXXPASSWORDXXX@ T02-VM-XXXX01.vss-eng.com:27017, T02-VM-XXXX02.vss-eng.com:27017/NH_DEVICEDATA?replicaSet=NH_Data_01

We are trying to connect to a replica set of 3 seperate VM servers and the error we continue to recieve is:

Type: MongoDB.Driver.MongoConnectionException
Message: Unable to connect to the primary member of the replica set.
Source: MongoDB.Driver
InnerExceptions: System.Exception[]
StackTrace: at MongoDB.Driver.Internal.ReplicaSetConnector.Connect(TimeSpan timeout, ConnectWaitFor waitFor)
at MongoDB.Driver.MongoServer.Connect(TimeSpan timeout, ConnectWaitFor waitFor)
at MongoDB.Driver.MongoServer.ChooseServerInstance(Boolean slaveOk)
at MongoDB.Driver.MongoServer.AcquireConnection(MongoDatabase database, Boolean slaveOk)
at MongoDB.Driver.MongoCursorEnumerator`1.AcquireConnection()
at MongoDB.Driver.MongoCursorEnumerator`1.GetFirst()
at MongoDB.Driver.MongoCursorEnumerator`1.MoveNext()
at MongoDB.Driver.MongoDatabase.GetCollectionNames()
at MongoDB.Driver.MongoDatabase.CollectionExists(String collectionName)
at VSS.Nighthawk.EntityModels.Dao.Mongo.MongoStorage`1.SetupCollection(String collectionName, IMongoCollectionOptions collectionOptions, Func`1 runCustomClassMap) in C:\TFS\Nighthawk\NH\RC\2.5.0.3_OEMDF\Server\CommonLibrary\EntityModels\Dao\Mongo\MongoStorage.cs:line 257
at VSS.Nighthawk.EntityModels.Dao.Mongo.MongoStorage`1..ctor(IMongoCollectionOptions collectionOptions, Func`1 runCustomClassMap) in C:\TFS\Nighthawk\NH\RC\2.5.0.3_OEMDF\Server\CommonLibrary\EntityModels\Dao\Mongo\MongoStorage.cs:line 32

We have not modified the 1.5 driver in any way.

The replica set is correctly set up. The output of the rs.isMaster() command is below:

PRIMARY> rs.isMaster()
{
"setName" : "NH_Data_01",
"ismaster" : true,
"secondary" : false,
"hosts" : [
"T02-VM-XXXX01:27017",
"T02-VM-XXXX02:27017"
],
"passives" : [
"T02-VM-XXXX03:27017"
],
"primary" : "T02-VM-XXXX01:27017",
"me" : "T02-VM-XXXX01:27017",
"maxBsonObjectSize" : 16777216,
"ok" : 1
}

Please let us know what the issue is with the connection string capability within the Driver.