1. Build a custom Ops Agent that includes the fix and turn on the config

```
(cd submodules/fluent-bit && git fetch --tags && git checkout bf86a32dc59a7071493dddbdff29521797690233)
git add submodules/fluent-bit
git commit -m "Update fluent-bit submodule to bf86a32dc59a7071493dddbdff29521797690233."
git checkout -b  lingshi-ipv4
git push origin  lingshi-ipv4

// Diff

 [OUTPUT]
-    Match_Regex                   ^(default_pipeline\.syslog)$
-    Name                          stackdriver
-    Retry_Limit                   3
-    net.connect_timeout_log_error False
-    resource                      gce_instance
-    stackdriver_agent             Google-Cloud-Ops-Agent-Logging/latest (BuildDistro=build_distro;Platform=linux;ShortName=linux_platform;ShortVersion=linux_platform_version)
-    tls                           On
-    tls.verify                    Off
-    workers                       8
+    Match_Regex         ^(default_pipeline\.syslog)$
+    Name                stackdriver
+    Retry_Limit         3
+    net.dns.prefer_ipv4 on
+    resource            gce_instance
+    stackdriver_agent   Google-Cloud-Ops-Agent-Logging/latest (BuildDistro=build_distro;Platform=linux;ShortName=linux_platform;ShortVersion=linux_platform_version)
+    tls                 On
+    tls.verify          Off
+    workers             8
```

2. Create and connect to 2 Windows 2016 VMs.

```
gcloud compute instances create --image-project windows-cloud --image-family windows-2016 windows-2016-old-fix
gcloud compute instances create --image-project windows-cloud --image-family windows-2016 windows-2016-new-fix
```

### 3. Install Ops Agents

On `windows-2016-old-fix`, install Ops Agent 2.8.1 (latest stable):

```
(New-Object Net.WebClient).DownloadFile("https://dl.google.com/cloudagents/add-google-cloud-ops-agent-repo.ps1", "${env:UserProfile}\add-google-cloud-ops-agent-repo.ps1")
cd "${env:UserProfile}"
$env:REPO_SUFFIX="20220113-1"; .\add-google-cloud-ops-agent-repo.ps1 -AlsoInstall
```

On `windows-2016-new-fix`, install Ops Agent custom build:

```
(New-Object Net.WebClient).DownloadFile("https://dl.google.com/cloudagents/add-google-cloud-ops-agent-repo.ps1", "${env:UserProfile}\add-google-cloud-ops-agent-repo.ps1")
cd "${env:UserProfile}"
$env:REPO_SUFFIX="20220113-2"; .\add-google-cloud-ops-agent-repo.ps1 -AlsoInstall
```

### 4. Verify the logs do not have logging api connection errors

Log file
 
```
notepad "C:\ProgramData\Google\Cloud Operations\Ops Agent\log\logging-module.log"
```
 
`windows-2016-old-fix` does not have them:

```
[2022/01/14 01:23:25] [ info] [engine] started (pid=4852)
[2022/01/14 01:23:25] [ info] [storage] version=1.1.5, initializing...
[2022/01/14 01:23:25] [ info] [storage] root path 'C:\ProgramData\Google\Cloud Operations\Ops Agent\run\buffers'
[2022/01/14 01:23:25] [ info] [storage] normal synchronization mode, checksum enabled, max_chunks_up=128
[2022/01/14 01:23:25] [ info] [storage] backlog input plugin: storage_backlog.2
[2022/01/14 01:23:25] [ info] [cmetrics] version=0.2.2
[2022/01/14 01:23:25] [ info] [input:storage_backlog:storage_backlog.2] queue memory limit: 47.7M
[2022/01/14 01:23:25] [ info] [output:stackdriver:stackdriver.0] metadata_server set to http://metadata.google.internal
[2022/01/14 01:23:25] [ warn] [output:stackdriver:stackdriver.0] client_email is not defined, using a default one
[2022/01/14 01:23:25] [ warn] [output:stackdriver:stackdriver.0] private_key is not defined, fetching it from metadata server
[2022/01/14 01:23:25] [ info] [output:stackdriver:stackdriver.1] metadata_server set to http://metadata.google.internal
[2022/01/14 01:23:25] [ warn] [output:stackdriver:stackdriver.1] client_email is not defined, using a default one
[2022/01/14 01:23:25] [ warn] [output:stackdriver:stackdriver.1] private_key is not defined, fetching it from metadata server
[2022/01/14 01:23:25] [ info] [output:stackdriver:stackdriver.0] worker #0 started
[2022/01/14 01:23:25] [ info] [output:stackdriver:stackdriver.0] worker #1 started
[2022/01/14 01:23:25] [ info] [output:stackdriver:stackdriver.0] worker #2 started
[2022/01/14 01:23:25] [ info] [output:stackdriver:stackdriver.0] worker #3 started
[2022/01/14 01:23:25] [ info] [output:stackdriver:stackdriver.0] worker #4 started
[2022/01/14 01:23:25] [ info] [output:stackdriver:stackdriver.0] worker #5 started
[2022/01/14 01:23:25] [ info] [output:stackdriver:stackdriver.0] worker #6 started
[2022/01/14 01:23:25] [ info] [output:stackdriver:stackdriver.0] worker #7 started
[2022/01/14 01:23:25] [ info] [output:stackdriver:stackdriver.1] worker #0 started
[2022/01/14 01:23:25] [ info] [output:stackdriver:stackdriver.1] worker #1 started
[2022/01/14 01:23:25] [ info] [output:stackdriver:stackdriver.1] worker #2 started
[2022/01/14 01:23:25] [ info] [output:stackdriver:stackdriver.1] worker #3 started
[2022/01/14 01:23:25] [ info] [output:stackdriver:stackdriver.1] worker #4 started
[2022/01/14 01:23:25] [ info] [output:stackdriver:stackdriver.1] worker #5 started
[2022/01/14 01:23:25] [ info] [output:stackdriver:stackdriver.1] worker #6 started
[2022/01/14 01:23:25] [ info] [output:stackdriver:stackdriver.1] worker #7 started
[2022/01/14 01:23:25] [ info] [http_server] listen iface=0.0.0.0 tcp_port=2020
[2022/01/14 01:23:25] [ info] [sp] stream processor started

```

`windows-2016-new-fix` still have them:

```
[2022/01/14 00:44:44] [ info] [engine] started (pid=3716)
[2022/01/14 00:44:44] [ info] [storage] version=1.1.5, initializing...
[2022/01/14 00:44:44] [ info] [storage] root path 'C:\ProgramData\Google\Cloud Operations\Ops Agent\run\buffers'
[2022/01/14 00:44:44] [ info] [storage] normal synchronization mode, checksum enabled, max_chunks_up=128
[2022/01/14 00:44:44] [ info] [storage] backlog input plugin: storage_backlog.2
[2022/01/14 00:44:44] [ info] [cmetrics] version=0.2.2
[2022/01/14 00:44:44] [ info] [input:storage_backlog:storage_backlog.2] queue memory limit: 47.7M
[2022/01/14 00:44:44] [ info] [output:stackdriver:stackdriver.0] metadata_server set to http://metadata.google.internal
[2022/01/14 00:44:44] [ warn] [output:stackdriver:stackdriver.0] client_email is not defined, using a default one
[2022/01/14 00:44:44] [ warn] [output:stackdriver:stackdriver.0] private_key is not defined, fetching it from metadata server
[2022/01/14 00:44:44] [ info] [output:stackdriver:stackdriver.1] metadata_server set to http://metadata.google.internal
[2022/01/14 00:44:44] [ warn] [output:stackdriver:stackdriver.1] client_email is not defined, using a default one
[2022/01/14 00:44:44] [ warn] [output:stackdriver:stackdriver.1] private_key is not defined, fetching it from metadata server
[2022/01/14 00:44:44] [ info] [output:stackdriver:stackdriver.0] worker #0 started
[2022/01/14 00:44:44] [ info] [output:stackdriver:stackdriver.0] worker #1 started
[2022/01/14 00:44:44] [ info] [output:stackdriver:stackdriver.0] worker #2 started
[2022/01/14 00:44:44] [ info] [output:stackdriver:stackdriver.0] worker #3 started
[2022/01/14 00:44:44] [ info] [output:stackdriver:stackdriver.0] worker #4 started
[2022/01/14 00:44:44] [ info] [output:stackdriver:stackdriver.0] worker #5 started
[2022/01/14 00:44:44] [ info] [output:stackdriver:stackdriver.0] worker #6 started
[2022/01/14 00:44:44] [ info] [output:stackdriver:stackdriver.0] worker #7 started
[2022/01/14 00:44:44] [ info] [output:stackdriver:stackdriver.1] worker #0 started
[2022/01/14 00:44:44] [ info] [output:stackdriver:stackdriver.1] worker #1 started
[2022/01/14 00:44:44] [ info] [output:stackdriver:stackdriver.1] worker #2 started
[2022/01/14 00:44:44] [ info] [output:stackdriver:stackdriver.1] worker #3 started
[2022/01/14 00:44:44] [ info] [output:stackdriver:stackdriver.1] worker #4 started
[2022/01/14 00:44:44] [ info] [output:stackdriver:stackdriver.1] worker #5 started
[2022/01/14 00:44:44] [ info] [output:stackdriver:stackdriver.1] worker #6 started
[2022/01/14 00:44:44] [ info] [output:stackdriver:stackdriver.1] worker #7 started
[2022/01/14 00:44:44] [ info] [http_server] listen iface=0.0.0.0 tcp_port=2020
[2022/01/14 00:44:44] [ info] [sp] stream processor started
[2022/01/14 00:44:56] [error] [upstream] connection #1912 to logging.googleapis.com:443 timed out after 10 seconds
[2022/01/14 00:44:57] [error] [upstream] connection #1856 to logging.googleapis.com:443 timed out after 10 seconds
[2022/01/14 00:44:58] [error] [upstream] connection #1968 to logging.googleapis.com:443 timed out after 10 seconds
[2022/01/14 00:44:59] [error] [upstream] connection #1984 to logging.googleapis.com:443 timed out after 10 seconds
[2022/01/14 00:45:01] [error] [upstream] connection #2008 to logging.googleapis.com:443 timed out after 10 seconds
[2022/01/14 00:45:02] [error] [upstream] connection #2044 to logging.googleapis.com:443 timed out after 10 seconds
[2022/01/14 00:45:02] [error] [upstream] connection #2024 to logging.googleapis.com:443 timed out after 10 seconds
[2022/01/14 00:45:03] [error] [upstream] connection #2072 to logging.googleapis.com:443 timed out after 10 seconds
```