Error: conncet etimedout aws rds with mysql

Question

Trying to connect mysql in ubuntu with remote rds mysql(Antares Sql) but facing etimedout error. Tried adding inbound rule aswell

All traffic ipv6

I am very new to aws. I used the default vpc

How shall I solve this problem and why is this Problem occurring?

Should I switch to windows?

Edited

I signed up as IAM user and selected rds

Chose mysql & Free tire

Db engine- 8.0.27

Db instance class- Burstable classes

Storage info - kept it as fedault

Availability & durability - Do not create a stand by instance

Subnet Group : default-vpc-05ff...add3

Security group: default

Publicly accessible & port :3306

Then set my user name and passwors

(Vcp was the default vcp i dint creat any)

Ragion -Singapore

After the database is created i tried to connect it with my mysql workbench It showes a timedout error I added a new inbound rule according to internet solution

Alltrafic and ipv6 anywhere

But the problem din't go.