nservicebus - Raven could not be contacted. We tried to access Raven using the following url -

raven not contacted. tried access raven using following url: http://localhost:8080. please ensure can open raven studio navigating http://localhost:8080. configure nservicebus use different raven connection string add connection string named "nservicebus.persistence" in config file, example: <connectionstrings>     <add name="nservicebus.persistence" connectionstring="http://localhost:9090" /> </connectionstrings> original exception: system.net.webexception: unable connect remote server ---> system.net.sockets.socketexception: no connection made because target machine actively refused 127.0.0.1:8080 

we using nsb 4.2.0 , raven 2.0.2375

five days ago started error in production 6 of our production nsbs (no publishers, mixture of sagas, , non-saga endpoints). didn't coincide change (although confusingly, did release following day)

even more bizarrely, 1 of our nsbs (a non-saga) not appear have issue though it's using same version of nsb , raven, , runs under same service account.

each effected endpoint throws exception our log seemingly @ random on average every 2.5 minutes.

this doesn't seem effect endpoints negatively - sagas continue able load state raven , endpoints receive , send messages.

i'd work out problem because it's flooding logs @ moment.