When issuing a ./brcontrol from any domain manager the same error message is thrown:
Error attaching to broker: localhost:426!
./brstart --daemon does not create a broker log file and the broker does not start
SMARTS 10.x / 2.x
There are 2 entries from the same IP address in the /etc/hosts file which are conflicting:
10.x.x.x admins machine
10.x.x.x <hostname>
Commenting out one of them will solve the issue.
#10.x.x.x admins machine
10.x.x.x <hostname>