NetworkConnection.SetChannelOption returning false

We tried increasing the ChannelOption.MaxPendingBuffers option for the 0 and 1 default channels but SetChannelOption returns false without any documentation as to why.

Why is the option not being set properly?

Code (CSharp):

1. public override void OnClientConnect(NetworkConnection conn)
2. {
3.             base.OnClientConnect(conn);
4.  
5.             // increase channel buffers
6.             var x = conn.SetChannelOption(0, ChannelOption.MaxPendingBuffers, 64);
7.             var y = conn.SetChannelOption(1, ChannelOption.MaxPendingBuffers, 64);
8. }

 

I know this topic is quite old, but I am having the same problem.
Edit: And now I found out what was wrong:
Did you add any channel during configuring the server?

Code (CSharp):

1. ConnectionConfig connectionConfig = new ConnectionConfig();
2. this.channelId = connectionConfig.AddChannel(QosType.ReliableSequenced);

Use this channelId for SetChannelOption.