Frontend Failing With Error Code 500 on Terraform Enterprise v202008-1 and v202009-1

Symptom Diagnosis

These following steps are to diagnose the symptom to determine the match to the scenario:

1. Terraform Enterprise is operating in Azure Cloud environment
2. Azure Application Gateway is fronting Terraform Enterprise
3. Navigate into Terraform Enterprise Host Machine via SSH
4. Execute the command sudo docker logs ptfe_atlas
5. The error message below is present in the log output

2020-09-17 00:56:09 [FATAL] [a1f5902f-36a0-49e4-a1c2-66cdc097b27b] 
IPAddr::InvalidAddressError (invalid address: 121.200.6.236:3029):
  config/initializers/rack_attack.rb:24:in `new'
  config/initializers/rack_attack.rb:24:in `block in <top (required)>'
  app/middleware/catch_json_parse_errors.rb:10:in `call'

Solutions

There are two possible solutions for the symptom:

1. The recommended solution is to upgrade Terraform Enterprise to version v202009-2 or higher
2. In the situation where the upgrade is unable to be performed immediately, a workaround solution is to create Rewrite Rule and override the header X-Forwarded-For with {var_client_ip} on the Azure Application Gateway
   • Please note that the Rewrite Rule feature is not supported with v1 of the Azure Application Gateway. If this SKU is in use the gateway will need to be replaced or the Terraform Enterprise instance will need to be upgraded.

Additional information

If you continue to experience the issues after following the guides, please contact HashiCorp Support to request for further assistance.