Damir,

Can you make sure the refresh token is the same among all servers?  There 
is a chance that the refresh token was revoked or expired - you may need to 
generate a new one.  Please let me know.

Thanks,

Ray

On Thursday, April 10, 2014 6:07:50 PM UTC-4, Ray Tsang (AdWords API Team) 
wrote:
>
> Damir,
>
> Feel free to email me by using the "reply to author" function.
>
> Are you using a client library?  Have you followed the instructions in our 
> OAuth 
> 2.0 
> guide<https://developers.google.com/adwords/api/docs/guides/authentication>
> ?
>
> Cheers,
>
> Ray
>
> On Thursday, April 10, 2014 7:55:11 AM UTC-4, Damir Abdullin wrote:
>>
>> Hello there,
>>
>> We experience strange behaviour causing invalid grant errors using OAuth2:
>>
>> com.google.api.client.auth.oauth2.TokenResponseException: 400 Bad Request 
>>> { 
>>>   "error" : "invalid_grant" 
>>> } 
>>>
>>>
>> Interesting thing is that we get this error on production server but 
>> everything is ok on other servers.
>> Can some of AdWords Devs reach me by email so I can post network id 
>> privately?
>>
>> Thank you.
>>
>

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