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Slowness within the AWS (EC2 and Workspaces) in Internet browsing itself, sometimes almost impossible to access a simple website.

Hello, We are experiencing browsing internet related slowness within the AWS (EC2 and Workspaces), browsing in simple websites itself is slow. We had the same problem on 03/2022, we hired support business, but they didn't solve the problem and it went back to normal on its own. Monitoring via CloudWatch, we noticed that the slowness is related to the NAT Gateway, as the documentation says the following: [*"If the value of ConnectionEstablishedCount is less than the value of ConnectionAttemptCount, clients behind the NAT gateway tried to establish new connections for which there was no response."*](https://docs.aws.amazon.com/vpc/latest/userguide/vpc-nat-gateway-cloudwatch.html) And as you can see in the attached graphs, whenever there is a slowdown, the ConnectionEstablishedCount metric is lower than the ConnectionAttemptCount metric ![Enter image description here](/media/postImages/original/IM4BtTaWe7TFqUgYfQiDmSsA) Internet browsing itself is slow, sometimes almost impossible to access a simple website, and this is directly impacting our internal use and customer service, as all our internal and support applications require the internet. It is also worth mentioning that we migrated our entire On-Premise structure to AWS in October/2021, and this is the second time this has happened. We even set up a new NAT Gateway in another AZ but it didn't work and it was still slow. Has anyone ever experienced this? Do you know what it could be and how to fix it? Thanks
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asked a month ago