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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.
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.