add proxy.conf troubleshooting for linux agent

Author: NarineM

articles/azure-monitor/agents/agent-manage.md

@@ -20,7 +20,7 @@ Upgrade to the latest release of the Log Analytics agent for Windows and Linux m
 
 | Environment | Installation method | Upgrade method |
 |--------|----------|-------------|
-| Azure VM | Log Analytics agent VM extension for Windows/Linux | Agent is automatically upgraded [after the VM model changes](../../virtual-machines/extensions/features-linux.md#how-agents-and-extensions-are-updated), unless you configured your Azure Resource Manager template to opt out by setting the property _autoUpgradeMinorVersion_ to **false**. Once deployed, however, the extension will not upgrade minor versions unless redeployed, even with this property set to true. Only Linux agent supports automatic update post deployment with_enableAutomaticUpgrade_ property is set(See [Enable Auto-Update for the Linux Agent](#enable-auto-update-for-the-linux-agent)). Major version upgrade is always manual. See [VirtualMachineExtensionInner.AutoUpgradeMinorVersion Property](https://docs.azure.cn/dotnet/api/microsoft.azure.management.compute.fluent.models.virtualmachineextensioninner.autoupgrademinorversion?view=azure-dotnet). |
+| Azure VM | Log Analytics agent VM extension for Windows/Linux | Agent is automatically upgraded [after the VM model changes](../../virtual-machines/extensions/features-linux.md#how-agents-and-extensions-are-updated), unless you configured your Azure Resource Manager template to opt out by setting the property _autoUpgradeMinorVersion_ to **false**. Once deployed, however, the extension will not upgrade minor versions unless redeployed, even with this property set to true. Only Linux agent supports automatic update post deployment with _enableAutomaticUpgrade_ property(See [Enable Auto-Update for the Linux Agent](#enable-auto-update-for-the-linux-agent)). Major version upgrade is always manual(See [VirtualMachineExtensionInner.AutoUpgradeMinorVersion Property](https://docs.azure.cn/dotnet/api/microsoft.azure.management.compute.fluent.models.virtualmachineextensioninner.autoupgrademinorversion?view=azure-dotnet)). |
 | Custom Azure VM images | Manual install of Log Analytics agent for Windows/Linux | Updating VMs to the newest version of the agent needs to be performed from the command line running the Windows installer package or Linux self-extracting and installable shell script bundle.|
 | Non-Azure VMs | Manual install of Log Analytics agent for Windows/Linux | Updating VMs to the newest version of the agent needs to be performed from the command line running the Windows installer package or Linux self-extracting and installable shell script bundle. |
 
@@ -252,6 +252,15 @@ Perform the following steps if your Linux computers need to communicate through
     ```
     sudo /opt/microsoft/omsagent/bin/service_control restart [<workspace id>]
     ```
+    If you see "cURL failed to perform on this base url" in the log, you can try removing '\n' in proxy.conf EOF to resolve the failure:
+    ```
+    od -c /etc/opt/microsoft/omsagent/proxy.conf
+    cat /etc/opt/microsoft/omsagent/proxy.conf | tr -d '\n' > /etc/opt/microsoft/omsagent/proxy2.conf
+    rm /etc/opt/microsoft/omsagent/proxy.conf
+    mv /etc/opt/microsoft/omsagent/proxy2.conf /etc/opt/microsoft/omsagent/proxy.conf
+    sudo chown omsagent:omiusers /etc/opt/microsoft/omsagent/proxy.conf
+    sudo /opt/microsoft/omsagent/bin/service_control restart [<workspace id>]
+    ```
 
 ## Uninstall agent
 Use one of the following procedures to uninstall the Windows or Linux agent using the command line or setup wizard.