This article solves the need to have a common source of links to other articles specifically related to blocking in the RSA NetWitness Endpoint product.
There are several possible issues related to blocking that can affect a specific endpoint, with factors including:
disable blocking in the agent driver during reboot
blocking occurs when agent is present on more than X number of systems when it should be disabled
Blocking inconsistently fails to initiate in a multi-server architecture for agents on secondary servers
Blocking is disabled following reboot of the target machine.
This has to do with a driver setting in the agent, and was fixed in both the 4.1.2 update, and also in 184.108.40.206 and later versions.
Blocking occurs when agent is present on more than X number of systems when it should be disabled based on the option set in the Machines panel of the UI.
This is split into two parts. The first is that if you have blocking enabled under Configure>Global Parameters and select a value that is lower than the number of modules present in the environment(so you have say 51 modules on 51 systems that need blocking but only allow for 50 before its ignored) the files will still be blocked anyways. This is fixed in 220.127.116.11
In the second scenario, the file will not actually be blocked but the option to block may still be available in the UI but should be greyed out. This is fixed in 18.104.22.168
Blocking inconsistently fails to initiate in a multi-server architecture for agents on secondary servers.
This is due to the secondary not getting the list of updated blocking hashes correctly. This was fixed in a code release for 22.214.171.124.