Problem:

On DirectControl 4.4.4, using adjoin -c specifying a specific container fails with:

RPC Error(rc=0xc0000022): Access Denied

This works on all other releases.

Example:
adjoin -V -u ian -c iltest.net/Servers/Unix -z linux iltest.net
.
.
.
Using RPC to create the computer account
Unexpected RPC Error(rc=0xc0000022): Access Denied
due to unexpected configuration or network error.
Please try the --verbose option or run 'adinfo --diag' to diagnose the problem.
Join to domain 'iltest.net', zone 'linux' failed. 

Cause:

Except for version 4.4.4, using adjoin with a specified container, will switch to ldap to create the computer object (instead of SMB). 
But in the 4.4.4 release, this was refactored to disregard this consideration. 
Instead, it creates the computer object in the default container and then move it to target destination. 
However, if the user does not have permission to create objects in the default container - adjoin will fail with "Access Denied".

Resolution:

Use adjoin -l to force creating computer objects through ldap