### Terraform Version ```shell Terraform v1.13.3 on linux_amd64 ``` ### Terraform Configuration Files ```terraform terraform { backend "consul" { address = "192.168.1.30:8500" scheme = "http" path = "terraform/state" } } ``` ### Debug Output ``` terraform init 2025-09-25T21:40:45.235-0400 [INFO] Terraform version: 1.13.3 2025-09-25T21:40:45.235-0400 [DEBUG] using github.com/hashicorp/go-tfe v1.74.1 2025-09-25T21:40:45.235-0400 [DEBUG] using github.com/hashicorp/hcl/v2 v2.24.0 2025-09-25T21:40:45.235-0400 [DEBUG] using github.com/hashicorp/terraform-svchost v0.1.1 2025-09-25T21:40:45.235-0400 [DEBUG] using github.com/zclconf/go-cty v1.16.3 2025-09-25T21:40:45.235-0400 [INFO] Go runtime version: go1.24.5 2025-09-25T21:40:45.235-0400 [INFO] CLI args: []string{"terraform", "init"} 2025-09-25T21:40:45.235-0400 [TRACE] Stdout is a terminal of width 156 2025-09-25T21:40:45.235-0400 [TRACE] Stderr is a terminal of width 156 2025-09-25T21:40:45.235-0400 [TRACE] Stdin is a terminal 2025-09-25T21:40:45.235-0400 [DEBUG] Attempting to open CLI config file: /home/user/.terraformrc 2025-09-25T21:40:45.235-0400 [DEBUG] File doesn't exist, but doesn't need to. Ignoring. 2025-09-25T21:40:45.235-0400 [DEBUG] ignoring non-existing provider search directory terraform.d/plugins 2025-09-25T21:40:45.235-0400 [DEBUG] ignoring non-existing provider search directory /home/user/.terraform.d/plugins 2025-09-25T21:40:45.235-0400 [DEBUG] ignoring non-existing provider search directory /home/user/.local/share/terraform/plugins 2025-09-25T21:40:45.235-0400 [DEBUG] ignoring non-existing provider search directory /home/user/.local/share/flatpak/exports/share/terraform/plugins 2025-09-25T21:40:45.235-0400 [DEBUG] ignoring non-existing provider search directory /var/lib/flatpak/exports/share/terraform/plugins 2025-09-25T21:40:45.235-0400 [DEBUG] ignoring non-existing provider search directory /usr/local/share/terraform/plugins 2025-09-25T21:40:45.235-0400 [DEBUG] ignoring non-existing provider search directory /usr/share/terraform/plugins 2025-09-25T21:40:45.235-0400 [INFO] CLI command args: []string{"init"} Initializing the backend... 2025-09-25T21:40:45.236-0400 [TRACE] Meta.Backend: built configuration for "consul" backend with hash value 1439040377 2025-09-25T21:40:45.236-0400 [TRACE] Meta.Backend: backend has not previously been initialized in this working directory 2025-09-25T21:40:45.236-0400 [TRACE] Meta.Backend: moving from default local state only to "consul" backend 2025-09-25T21:40:45.236-0400 [DEBUG] checking for provisioner in "." 2025-09-25T21:40:45.241-0400 [DEBUG] checking for provisioner in "/usr/bin" 2025-09-25T21:40:45.241-0400 [TRACE] backend/local: state manager for workspace "default" will: - read initial snapshot from terraform.tfstate - write new snapshots to terraform.tfstate - create any backup at terraform.tfstate.backup 2025-09-25T21:40:45.241-0400 [TRACE] statemgr.Filesystem: reading initial snapshot from terraform.tfstate 2025-09-25T21:40:45.241-0400 [TRACE] statemgr.Filesystem: snapshot file has nil snapshot, but that's okay 2025-09-25T21:40:45.241-0400 [TRACE] statemgr.Filesystem: read nil snapshot 2025-09-25T21:40:45.241-0400 [TRACE] Meta.Backend: ignoring local "default" workspace because its state is empty ╷ │ Error: Failed to get existing workspaces: Unexpected response code: 500 (invalid key name, keys should respect the "^[a-zA-Z0-9,_./\\-?&=]+$" format) ``` The error from the Consul logs: ``` 2025-09-26T01:40:45.248800+00:00 pi01 consul[1212181]: 2025-09-26T01:40:45.247Z [ERROR] agent.http: Request error: method=GET url="/v1/kv/terraform/state-env:?keys=&separator=%2F" from=10.50.2.12:57896 error="invalid key name, keys should respect the \"^[a-zA-Z0-9,_./\\-?&=]+$\" format" ``` ### Expected Behavior A successful init when using Consul `v1.21.5`, the same way as it is working on `v1.21.4` ### Actual Behavior The init is failing with ``` Error: Failed to get existing workspaces: Unexpected response code: 500 (invalid key name, keys should respect the "^[a-zA-Z0-9,_./\\-?&=]+$" format) ``` It work well on Consul v1.21.4 It's unclear if this is a temporary bug in Consul that will be fixed, or a new, permanent feature. The pull request (https://github.com/hashicorp/consul/pull/22682) calls this a fix, which implies that others will now have to adjust their configurations. Given that both are HashiCorp products, a seamless integration should be a priority. ### Steps to Reproduce 1. Install/Upgrade Consul version 1.21.5 2. Configure the Consul Backend 3. Run `terraform init` ### Additional Context _No response_ ### References https://github.com/hashicorp/consul/pull/22682 ### Generative AI / LLM assisted development? _No response_