Answered: Windows Agent data not inventoried - Logs OK

So I removed both User and Pwd and set SSL and AuthRequired to 0.

Still the same problem. Access.log shows the three lines:

10.110.100.177 - - [23/Feb/2017:13:31:17 +0100] "GET /ocsinventory/deploy/label HTTP/1.1" 400 484 "-" "OCS-NG_WINDOWS_AGENT_v2.3.0.0"
10.110.100.177 - - [23/Feb/2017:13:31:18 +0100] "POST /ocsinventory HTTP/1.1" 301 531 "-" "OCS-NG_WINDOWS_AGENT_v2.3.0.0"
10.110.100.177 - - [23/Feb/2017:13:31:18 +0100] "GET /ocsinventory/ HTTP/1.1" 400 484 "-" "OCS-NG_WINDOWS_AGENT_v2.3.0.0"

error.log gets no new entries. Agent log still looks the same.