| # Support Transport Layer Security (TLS) |
| Transport Layer Security (TLS) is a very common security way when transport data through Internet. |
| In some use cases, end users report the background: |
| |
| > Target(under monitoring) applications are in a region, which also named VPC, |
| at the same time, the SkyWalking backend is in another region (VPC). |
| > |
| > Because of that, security requirement is very obvious. |
| |
| ## Authentication Mode |
| Only support **no mutual auth**. |
| - Use this [script](../../../../../tools/TLS/tls_key_generate.sh) if you are not familiar with how to generate key files. |
| - Find `ca.crt`, and use it at client side |
| - Find `server.crt` ,`server.pem` and `ca.crt`. Use them at server side. Please refer to [gRPC SSL](../../backend/grpc-ssl.md) |
| for more details. |
| |
| ## Open and config TLS |
| |
| ### Agent config |
| - Place `ca.crt` into `/ca` folder in agent package. Notice, `/ca` is not created in distribution, please create it by yourself. |
| |
| Agent open TLS automatically after the `/ca/ca.crt` file detected. |
| |
| o make sure can't access other ports out of region (VPC), such as firewall, proxy. |
