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Hello.
By default, 2500 security groups can be created.
https://docs.aws.amazon.com/vpc/latest/userguide/amazon-vpc-limits.html#vpc-limits-security-groups
I recommend that you contact AWS Support to reduce your quota.
https://docs.aws.amazon.com/kms/latest/developerguide/limits.html
To request a quota decrease, to change a quota that is not listed in Service Quotas, or to change a quota in an AWS Region where Service Quotas for AWS KMS is not available, please visit AWS Support Center and create a case.
For inquiries regarding service quotas, please open a case with AWS Support under "Account and billing".
Inquiries under "Account and billing" can be made free of charge.
https://docs.aws.amazon.com/awssupport/latest/user/case-management.html
Yes, you can reduce the number of security groups that can be created in a region through Service Quotas. The default limit is 2,500 security groups per region, but this can be adjusted lower based on your needs.
To modify the quota:
- Sign in to the AWS Management Console and open the Service Quotas console (link) .
- Choose the service "VPC" and then select the quota "VPC security groups per Region".
- Enter the new quota value - in your case 300 security groups.
- Click Request quota increase. AWS will review the request and notify you by email regarding approval or rejection.
It's a good practice to limit the number of security groups to what is required. This helps maintain a secure and organized AWS environment.
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The method you presented is for increasing quotas. You cannot reduce your quota that way. When you try to run it, it will look like the image below.