Forum Discussion
ATP connectivity challenge HTTP Error 400
Hi, I am trying to onboard an ATP client on Windows 10 using SCCM.
SCCM states the policy was applied correctly. The ATP service is running, the sense logs only contains warning and error messages stating the following:
Contacted server 20 times, failed 14 times and succeeded 6 times. URI: https://winatp-gw-neu.microsoft.com/. Last HTTP error code: 400
The ATP connectivity verifier states the client is onboarded along with HTTP code 200 success messages.
Any ideas what to check?
kim oppalfens- exact same problem here...
WDATPConnectivityAnalyzer shows no errors at all, but the Eventlog shows Connection failed - error 400.- I've opened a support ticket and have had one session with a support engineer. No results so far.
Is your data in Europe by any chance?- Yes, we are in Europe as well.
Same issue here, I get lots of the following errors in the SENSE event logs.
Contacted server 58 times, all failed, URI: https://winatp-gw-eus.microsoft.com/. Last HTTP error code: 400
Have you had any luck from support?
My issue was resolved by offboarding from a different tenant and onboard subsequently.
Even if you reset the device, if it has been part of a previous poc on atp the onboarding will fail.
and if we can't remember the tenant that we used before to login and get the offboarding script I assume there is nothing else we can do?
Check your proxy and firewall.
