I have two network drives in my local network - one is WDMyCloud device and the other is a USB hard drive connected to AirPort Extreme. All of a sudden the mac cannot connect these devices using AFP. I am able to connect the disk using SMB.
SO if I use smb://wdmycloud-device it works fine but when trying afp://wdmycloud-device I'm getting the following error:
There was a problem connecting to the server “wdmycloud-device”. Check the server name or IP address, and then try again. If you continue to have problems, contact your system administrator
I'm using OS X 10.11.5.