LDP Attribute query help

I cannot recall how to search attributes in LDP for some reason what I'm trying isn't working.
Ultimately I'm trying to query attributes that are of "Category 1" so I can determine which attributes I can apply the Confidentiality Bit to.

The query is:

(&(objectCategory=attributeSchema)(systemFlags:1.2.840.113556.1.4.803:=16))

Are you supposed to connect to a Domain Controller via LDP.exe, and then Browse > Search, pasting the query into the "Filter" box?
When I try that way, I get in the output:

-----------
***Searching...
ldap_search_ext_s(ld, "CN=Schema,CN=Configuration,DC=cafe,DC=com", 2, "(&(objectCategory=attributeSchema)(systemFlags:1.2.840.113556.1.4.803:=16))"), attrList,  0, svrCtrls, ClntCtrls, 0, 0 ,&msg)
Error: Search: Timeout. <85>
Server error: <empty>
Error<94>: ldap_parse_result failed: No result present in message
Server error: <empty>
Getting 0 entries:
-----------
garryshapeAsked:
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Michael PfisterCommented:
When trying your query I do not get a timeout.
What do you enter for Base DN?
 Where do you start ldp? On your workstation or the DC?
The first connect works? The bind as well?

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