amazon-ebs: WinRM connection error unknown error Post "https://<ip>:5986/wsman": EOF

#### Overview of the Issue

Getting an unusual error when I am trying to connect to a Windows instance from an already existing AMI.

```bash
12:42:39:342 INFO: [win2012_x64_aws_std_en_us] [packer] 2025/10/08 12:42:39 packer-plugin-amazon_v1.5.0_x5.0_windows_amd64.exe plugin: 2025/10/08 12:42:39 Using host value: 10.237.78.166
12:42:39:345 INFO: [win2012_x64_aws_std_en_us] [packer] 2025/10/08 12:42:39 packer-plugin-amazon_v1.5.0_x5.0_windows_amd64.exe plugin: 2025/10/08 12:42:39 [INFO] Attempting WinRM connection...
12:42:39:347 INFO: [win2012_x64_aws_std_en_us] [packer] 2025/10/08 12:42:39 packer-plugin-amazon_v1.5.0_x5.0_windows_amd64.exe plugin: 2025/10/08 12:42:39 [DEBUG] connecting to remote shell using WinRM
12:43:24:397 INFO: [win2012_x64_aws_std_en_us] [packer] 2025/10/08 12:43:24 packer-plugin-amazon_v1.5.0_x5.0_windows_amd64.exe plugin: 2025/10/08 12:43:24 [ERROR] connection error: unknown error Post "https://10.237.78.166:5986/wsman": EOF
```

#### Reproduction Steps

- Attempt a packer build

### Plugin and Packer version

- Packer v1.14.2
- Plugin version: 1.5.0

### Simplified Packer Buildfile

```
source "amazon-ebs" "win-ami" {
region = var.region
vpc_id = var.vpc_id
subnet_id = var.subnet
security_group_id = var.security_group

source_ami = var.ami_id # use an existing Windows AMI

instance_type = var.instance_type

communicator = "winrm"
winrm_username = var.ami_user
winrm_password = "${var.admin_password}"
winrm_use_ssl = true
winrm_timeout = "30m"
winrm_port = 5986
winrm_insecure = true

ssh_interface = "private_ip"
ssh_username = var.ami_user

ami_name = "${var.vm_name}-{{uuid}}-{{timestamp}}"
ami_description = "Packer-Import process: ${var.display_name}"
ami_regions = [var.region]

launch_block_device_mappings {
device_name = var.ami_device_name
volume_size = var.disk_size / 1024
volume_type = "gp3"
delete_on_termination = true
}
}
```

### Operating system and Environment details
- Windows 11 25H2 (Powershell 7.5.3)
- Ubuntu 24.04 (under WSL2 gives me the same issue too)