Troubleshooting your web apps

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Note

These troubleshooting tips are meant for the web app administrator rather than the end user. For end users, if you encounter any problems, contact your web app administrator. All instances of you in the following paragraphs refer to the web app admin.

Troubleshoot network errors

Description

Your end user sees a network banner Network Error upon loading the web app endpoint.

Cause

The most common issues are as follows:

• The admin did not assign the user that is attempting to log on to the new application.

• The admin did not add the necessary actions to your IAM roles.

• You see a list of S3 Access Grants assigned to your user, but CORS is not configured correctly for your Amazon S3 bucket or buckets.

Solution

• In IAM Identity Center, make sure to assign the user to the correct application. Or, if you have a group assigned, make sure that the user attempting to log in belongs to the correct group. This is described in Assign or add users or groups to Transfer Family web app.

• Check whether your roles contain the necessary actions in the Custom trust policy for both sts:AssumeRole and sts:SetContext actions. This is described in Configure IAM roles for Transfer Family web apps.

• Check the CORS policy for all of the buckets used by your web app. This is described in Set up Cross-origin resource sharing (CORS) for your Amazon S3 bucket.

Troubleshoot configured bucket not appearing

Description

Everything appears to be configured correctly, but the Amazon S3 bucket doesn't appear in the web app.

Cause

One possible cause is that the Amazon S3 bucket is not in the same account as the web app.

Solution

Ensure that the Amazon S3 bucket is in the same account as the web app. Cross-account buckets are not currently supported.

Troubleshoot custom URL errors

Description

When your end user signs into the web app, they receive the error message Authorization failed: missing authorization code.

Cause

If you used CloudFront directly, rather than the supplied AWS CloudFormation template, you have likely misconfigured the origin request policy to not forward query strings.

Solution

Update your origin request policy to forward query strings and cookies to the origin.

Description

When your end user attempts to access a Transfer Family web app, they receive a 404 response.

Cause

If you used CloudFront directly, rather than the supplied AWS CloudFormation template, you have likely misconfigured the cache policy to include the Host header in the cache key or misconfigured the origin request policy to forward the Host header.

Solution

• Make sure that your cache policy does not include the Host header in the cache key

• Make sure that your origin request policy does not forward the Host header.

Troubleshoot miscellaneous errors

Description

Your end user cannot log in, or cannot view any buckets or files, or you receive another error.

Cause

One possible cause is that the IAM Identity Center instance ARN doesn't match the value for your grants ARN or your web app IAM Identity Center instance ARN.

Solution

Check the following items to see if they match.

• In IAM Identity Center, navigate to Settings and view the Instance ARN.

  arn:aws:sso:::instance/ssoins-instance-identifier

• In Amazon S3, navigate to Access Grants and view your IAM Identity Center instance ARN.

  arn:aws:sso::account-id:application/ssoins-instance-identifier/apl-1234567890abcdef0

• In Transfer Family, navigate to your web app details page and view its Instance ARN.

  arn:aws:sso:::instance/ssoins-instance-identifier

The instance-identifier value must be the same in all three of these places.