{"id":1093,"hash":"74aa2368ac138039ea2e0e5c3e1af6b0e27c55d8963eb85f78d7ba37e2064c1f","pattern":"boto3 client NoRegionError: You must specify a region error only sometimes","full_message":"I have a boto3 client :\n\nboto3.client('kms')\n\nBut it happens on new machines, They open and close dynamically. \n\n    if endpoint is None:\n        if region_name is None:\n            # Raise a more specific error message that will give\n            # better guidance to the user what needs to happen.\n            raise NoRegionError()\n\nWhy is this happening? and why only part of the time?","ecosystem":"pypi","package_name":"linux","package_version":null,"solution":"One way or another you must tell boto3 in which region you wish the kms client to be created.  This could be done explicitly using the region_name parameter as in:\n\nkms = boto3.client('kms', region_name='us-west-2')\n\nor you can have a default region associated with your profile in your ~/.aws/config file as in:\n\n[default]\nregion=us-west-2\n\nor you can use an environment variable as in:\n\nexport AWS_DEFAULT_REGION=us-west-2\n\nbut you do need to tell boto3 which region to use.","confidence":0.95,"source":"stackoverflow","source_url":"https://stackoverflow.com/questions/40377662/boto3-client-noregionerror-you-must-specify-a-region-error-only-sometimes","votes":367,"created_at":"2026-04-19T04:52:20.949401+00:00","updated_at":"2026-04-19T04:52:20.949401+00:00"}