The cluster node to which you are connected has the status of BLOCKED if it has been awaiting a response from another node for more than the designated blocking period.

The node being waited upon has the status of BLOCKING. The BLOCKING node can be repaired using the process described in Setting a Timekeeper and Repairing Active Cluster Nodes. However, if this occurs frequently and is caused by normal operations, you might want to adjust the designated blocking period, which is the maximum amount of time required for normal operations to complete.