AWS provides a rich set of tools and capabilities for managing access. Users can authenticate with multi-factor authentication (MFA), federate using an external identity provider, and obtain temporary credentials with limited permissions. AWS Identity and Access Management (IAM) provides fine-grained access control, and AWS IAM Identity Center makes it easy to manage access across your entire organization using AWS Organizations.
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Temporary security credentials are generated by AWS STS. By default, AWS STS is a global service with a single endpoint at However, you can also choose to make AWS STS API calls to endpoints in any other supported Region. This can reduce latency (server lag) by sending the requests to servers in a Region that is geographically closer to you. No matter which Region your credentials come from, they work globally. For more information, see Managing AWS STS in an AWS Region.
Many organizations maintain more than one AWS account. Using roles and cross-account access, you can define user identities in one account, and use those identities to access AWS resources in other accounts that belong to your organization. This is known as the delegation approach to temporary access. For more information about creating cross-account roles, see Creating a role to delegate permissions to an IAM user. To learn whether principals in accounts outside of your zone of trust (trusted organization or account) have access to assume your roles, see What is IAM Access Analyzer?.
Q: How do I start using Amazon Cognito? You can easily get started by visiting the AWS Console. If you do not have an Amazon Web Services account, you can create an account when you sign in to the console. Once you have created a user pool for user management or an identity pool for federated identities or sync operations, you can download and integrate the AWS Mobile SDK with your app. Alternatively you can call the Cognito server-side APIs directly, instead of using the SDK. See our developer guide for more information.
Q: Does Amazon Cognito expose server-side APIs? Yes. Cognito exposes server-side APIs. You can create your own custom interface to Cognito by calling these APIs directly. The server-side APIs are described in the Developer Guide.
You can use our import tool to migrate your existing users into an Amazon Cognito user pool. User attribute values are imported from a .csv file, which can be uploaded through the console, our APIs, or CLI. When imported users first sign in, they confirm their account and create a new password with a code sent to their email address or phone. There is no additional cost for using the import tool. To learn more, see the import tool documentation.
Q: How does Cognito Identity help me control permissions and access AWS services securely? Cognito Identity assigns your users a set of temporary, limited privilege credentials to access your AWS resources so you do not have to use your AWS account credentials. The permissions for each user are controlled through AWS IAM roles that you create. You can define rules to choose the IAM role for each user, or if you are using groups in a Cognito user pool, you can assign IAM roles based on groups. Cognito Identity also allows you to define a separate IAM role with limited permissions for guest users who are not authenticated. In addition, you can use the unique identifier that Cognito generates for your users to control access to specific resources. For example you can create a policy for an S3 bucket that only allows each user access to their own folder within the bucket.
Q: What are unauthenticated users? Unauthenticated users are users who do not authenticate with any identity provider, but instead access your app as a guest. You can define a separate IAM role for these users to provide limited permissions to access your backend resources.
Q: How can I analyze and query the data stored in the Cognito Sync store? With Cognito Streams, you can push sync store data to a Kinesis stream in your AWS account. You can then consume this stream and store the data in a way that makes it easy for you to analyze such as a Amazon Redshift database, an RDS instance you own or even an S3 file. We have published sample Kinesis consumer application to show how to store the updates data in Amazon Redshift.
If you are using the Cognito Identity to create a User Pool, you pay based on your monthly active users (MAUs) only. A user is counted as a MAU if, within a calendar month, there is an identity operation related to that user, such as sign-up, sign-in, token refresh, password change, or a user account attribute is updated. You are not charged for subsequent sessions or for inactive users with in that calendar month. Separate charges apply for optional use of SMS messaging as described below.
Returns a set of temporary security credentials that you can use to access AWS resources. These temporary credentials consist of an access key ID, a secret access key, and a security token. Typically, you use AssumeRole within your account or for cross-account access. For a comparison of AssumeRole with other API operations that produce temporary credentials, see Requesting Temporary Security Credentials and Comparing the AWS STS API operations in the IAM User Guide.
To assume a role from a different account, your AWS account must be trusted by the role. The trust relationship is defined in the role's trust policy when the role is created. That trust policy states which accounts are allowed to delegate that access to users in the account.
You might have to reduce the number of recipients in the message header for the host about which you're receiving this error. If you send the message again, it's placed in the queue again. If the receiving server is available, the message is delivered. For more information, see Fix email delivery issues for error code 4.4.7 in Exchange Online.4.5.3Too many recipientsThe message has more than 200 SMTP envelope recipients from the same domain.An envelope recipient is the original, unexpanded recipient that's used in the RCPT TO command to transmit the message between SMTP servers. When this error is returned by Microsoft 365 or Office 365, the sending server must break up the number of envelope recipients into smaller chunks (chunking) and resend the message.4.7.26Access denied, a message sent over IPv6 [2a01:111:f200:2004::240] must pass either SPF or DKIM validation, this message is not signedThe sending message sent over IPv6 must pass either SPF or DKIM.For more information, see Support for anonymous inbound email messages over IPv6.4.7.321starttls-not-supported: Destination mail server must support TLS to receive mail.DNSSEC checks have passed, yet upon connection, destination mail server doesn't respond to the STARTTLS command. The destination server responds to the STARTTLS command, but the TLS handshake fails.This message usually indicates an issue on the destination email server. Check the validity of the recipient address. Determine if the destination server is configured correctly to receive the messages.4.7.322certificate-expired: Destination mail server's certificate is expired.DNSSEC checks have passed, yet upon establishing the connection, the destination mail server provides a certificate that is expired.A valid X.509 certificate that isn't expired must be presented. X.509 certificates must be renewed after their expiration, commonly annually.4.7.323tlsa-invalid: The domain failed DANE validation.Records are DNSSEC authentic, but one or multiple of these scenarios occurred: The destination mail server's certificate doesn't match with what is expected per the authentic TLSA record. Authentic TLSA record is misconfigured. Destination domain is being attacked. Any other DANE failure.This message usually indicates an issue on the destination email server. Check the validity of recipient address and determine if the destination server is configured correctly to receive messages. For more information, see DANE protocol: updates and operational guidance4.7.324dnssec-invalid: Destination domain returned invalid DNSSEC recordsThe destination domain indicated it was DNSSEC-authentic, but Exchange Online wasn't able to verify it as DNSSEC-authentic.For more information, see Overview of DNSSEC.4.7.325certificate-host-mismatch: Remote certificate MUST have a common name or subject alternative name matching the hostname (DANE)This happens when the presented certificate identities (CN and SAN) of a destination SMTP target host don't match any of the domains or MX host.This message usually indicates an issue on the destination email server. Check the validity of recipient address and determine if the destination server is configured correctly to receive messages. For more information, see How SMTP DNS-based Authentication of Named Entities (DANE) works to secure email communications.4.7.500-699Access denied, please try again laterSuspicious activity has been detected and sending has been temporarily restricted for further evaluation.If this activity is valid, this restriction will be lifted shortly.4.7.850-899Access denied, please try again laterSuspicious activity has been detected on the IP in question, and it has been temporarily restricted while it's being further evaluated.If this activity is valid, this restriction will be lifted shortly.5.0.350Generic error, x-dg-ref header is too long, or Requested action not taken: policy violation detected (AS345)5.0.350 is a generic catch-all error code for a wide variety of non-specific errors from the recipient's email organization. The specific x-dg-ref header is too long message is related to Rich Text formatted messages. The specific Requested action not taken: policy violation de