This error is often due to security permissions problems. Check if the receive location works fine when pointing to a different container (e.g. the Users container LDAP://CN=Users,DC=test,DC=com). If so:
Yes. The Send Adapter is fully compatible with dynamic ports.
A sample orchestration showing the use of ActiveADAPTER with dynamic send ports is included in the ActiveADAPTER\Samples folder.
Yes. The Active Directory Receive Adapter can be used to create a Receive Location that queries Active Directory at regular intervals and submit the results to your BizTalk application. A message can be submitted to BizTalk at every polling interval, or only when a change occurs in the query results (this is the "On Change Only" option on the Active Directory Receive Adapter property configuration).
In addition, the Active Directory Send Adapter can be used with a Solicit-Response Send Port to perform an on-demand query. You just send your query parameters to the send port in a message that conforms to the supplied schema, and receive your results back in a new message.
After installing ActiveADAPTER you will see a new transport type option when configuring a send port or receive location. With BizTalk send ports, you can create, delete, rename, move, and modify Active Directory objects. With BizTalk receive locations, you can draw XML messages into BizTalk containing Active Directory query results.
On your Programs menu you will also have an ActiveADAPTER program group containing shortcuts to documentation, sample orchestrations and schemas to get you developing your solutions quickly.