504 gateway time-out error

If you are seeing 504 gateway time-out errors when running Transaction List Screening (TLS), your system might be low on resources. Increase your environment resources to resolve this issue.

A 504 error means nginx has waited too long for a response and has timed out. There might be multiple reasons for the problem.

Possible fixes include:

Increasing the nginx proxy_read_timeout default of five minutes to be longer, for example, to 10 minutes. The steps to do so are as follows:

Log into the OpenShift UI: https://<openshift_hostname>:8443
On the right-hand side of the page click the project where FCI Platform Kubernetes was installed.
Click Applications > Pods
Find the FCI Common UI NGINX pod. It will have a name similar to fci-common-ui-nginx-xxxxxxxxxx-xxxxx
Click on the Terminal tab.

Change to the locations-files directory

 ```
 cd /etc/nginx/conf.d/location-files
 ```

Change the nginx-location-fcai.conf file from:

location /tls/api/v1 {
  proxy_pass https://fcai-fci-alerts-insight-tls-analytics:3333;
  client_max_body_size 20m;
}

To the following:

location /tls/api/v1 {
  proxy_pass https://fcai-fci-alerts-insight-tls-analytics:3333;
  client_max_body_size 20m;
  proxy_read_timeout 600s;
}

This will change the read timeout to ten minutes (600 seconds).

Run the following command to reload your changes:
```
nginx -s reload
```

Ensuring all TLS containers and TLS dependent containers are running in a good state. You can determine the state by running the following commands:
```
oc get pods
oc describe pod <pod_name>
```
Restart containers in a poor or failed state. TLS analytics and Mongo DB containers in a poor or failed state can be a reason for the 504 error.
Reduce the TLS load or increase cluster resources such as CPU, memory, and disk.
Check the TLS analytics container logs for failures and resolve them.