Currently SignalR ServiceBus 1.2 package dependency WindowsAzure.ServiceBus>=2.0.1
WindowsAzure.ServiceBus 2.1.0 the assembly version is Microsoft.ServiceBus, Version=184.108.40.206
But in SignalR ServiceBus source, it uses WindowsAzure.ServiceBus 2.1.3 which assembly version is Microsoft.ServiceBus, Version=220.127.116.11
With WindowsAzure.ServiceBus 2.0.1, SignalR ServiceBus 1.2 will throw error that Could not load Microsoft.ServiceBus, Version=18.104.22.168
So probably SignalR ServiceBus 1.2 package dependency WindowsAzure.ServiceBus should >=2.1.3
I fixed this in TFS since the 1.x branch doesn't have the nuspecs checked into git.
In SignalR ServiceBus 2.0.2, dependency WindowsAzure.ServiceBus is >=2.1.0
@davidfowl confirmed that SignalR ServiceBus 1.2 dependency WindowsAzure.ServiceBus min version should be same as in SignalR ServiceBus 2.0.2
So SignalR ServiceBus 1.2 dependency WindowsAzure.ServiceBus need to be updated to >=2.1.0
I changed the ServiceBus dependency to 2.1.0 to match the dependency SignalR 2.0.2 will take.