I have an open support case for this as well. It seems to be a known issue 
they are working on for 1+ months. Not sure when it will be fixed.


Den fredag 23 mars 2018 kl. 20:24:30 UTC+1 skrev Anu V:
>
> Backends are healthy, I found this 502 errors across my few projects using 
> AppEngine.
>
> All instances are able to access and work normally, I've tested using curl 
> to send a request directly to instance's private ip and it works all the 
> time.
>
>
> On Saturday, March 24, 2018 at 2:07:30 AM UTC+7, Navi Aujla (Google Cloud 
> Support) wrote:
>>
>> Hello Anu,
>>
>> The "*failed_to_connect_to_backend" *error message indicates that load 
>> balancer is failing to connect to backends. There could be many possible 
>> reasons for it. For example: Unhealthy instance if reported by health 
>> check, incorrect URL mapping 
>> <https://cloud.google.com/compute/docs/load-balancing/http/url-map>, 
>> high backend utilization causing backend not to respond to the load 
>> balancer requests. You can refer to this thread 
>> <https://groups.google.com/forum/#!topic/gce-discussion/mXmnB-Ab5Z4>for 
>> more information and check instance system/error and access logs. 
>>
>> On Friday, March 23, 2018 at 9:06:00 AM UTC-4, Anu V wrote:
>>>
>>> I'am experiencing too many 502 errors from Load Balance and the 
>>> instances are working fine. (
>>>
>>>
>>> @type: "
>>> type.googleapis.com/google.cloud.loadbalancing.type.LoadBalancerLogEntry" 
>>>
>>> statusDetails: "failed_to_connect_to_backend" 
>>>
>>> I've also found that this happen on my few projects starting about 12 
>>> hours ago, I've checked https://status.cloud.google.com/ and it said 
>>> all working fine.
>>> I cannot upgrade support level to create the ticket, so I am posting it 
>>> here to ask if anyone having the same problem as I am?
>>>
>>>

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