docs: add troubleshooting page

docs/content/docs/changelog.md

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 title: Changelog
-prev: /docs/advanced
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docs/content/docs/troubleshooting.md

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+---
+title: Troubleshooting
+prev: /docs/advanced
+weight: 300
+toc: false
+---
+
+
+{{% steps %}}
+
+### http: proxy error: tls: failed to verify certificate: x509: certificate
+
+The actual error is a TLS error. The most common cause is that the target has a self-signed certificate.
+
+```yaml
+tsdproxy.enable: true
+tsdproxy.scheme: https
+tsdproxy.tlsvalidate: false
+
+```
+
+### 2024/12/06 15:17:11 http: proxy error: dial tcp 172.18.0.1:8001: i/o timeout
+
+This error is caused by the target not being reachable. It's a network error.
+
+#### Cause: Firewall
+
+Most likely the firewall is blocking the traffic. In case of UFW execute this command:
+
+```bash
+sudo ufw allow in from 172.17.0.0/16
+```
+
+#### Cause: Failed docker autodetection
+
+Try to disable autodetection and define the port:
+
+```yaml
+labels:
+  tsdproxy.enable: "true"
+  tsdproxy.autodetect: "false"
+  tsdproxy.port: 8001
+```
+
+{{%/ steps %}}