Serial Console Servers

• Black Box Serial Server
• Linux Serial Console
• Windows Serial Console Terminal
• Serial Console Server

Secure Data Center & IT Infrastructure Manager

A Console Server, provides secure remote console management of any device with a serial or USB console port, including Cisco routers, switches and firewalls, Servers, PBXs and more. It is a single hardware solution that provides a secure alternate route to monitor IT, networking, security and power devices from multiple vendors. While software management tools can be used for performance monitoring, and some remote troubleshooting, they only work when the network is up. A Console Server, commonly used as an Out-of-Band Management Solution, ensures that on-site infrastructure is accessible, even during system or network outages. They can be used to reconfigure, reboot and reimage remotely across the internet or WANs. Disruption and downtime are minimized by providing better visibility of the physical environment and the physical status of equipment. This ensure business continuity through improved uptime and efficiencies.

The serial console server provides an alternate path to devices at your remote sites when your primary network is impaired. Ensures on-site infrastructure is accessible even during system or network outages. Integrates seamlessly with your existing IT & network management systems. Minimizes disruption and downtime, ensuring business continuity. Avocent ACS 8000 Serial Console ACS8016SAC - Console server - 16 ports - GigE, RS-232, RS-422, RS-485 - 1U - rack-mountable Manufacturer#: ACS8016SAC-404 Discount Price $1,485.00 Regular Price $2,374.00. Serial console 1. Go to the servers status page in your account. Click on KVM/IP: 3. Create a session to get the credentials.

A Perle IOLAN Console Server gives your data center managers, IT professionals and network operations center (NOC) personnel the only serial console server on the market with all of the advanced security functionality needed to easily perform secure remote data center management and out-of-band management of IT assets from anywhere in the world. They are also the ideal solution for large distributed enterprises with multiple branches— such as banks, insurance companies, hospitals, utilities, retail and school systems— that may not have IT staff on-site

A console server (also referred to as console access server, console management server, serial concentrator, or serial console server) is a device or service that provides access to the system console of a computing device via networking technologies. Serial console servers are less expensive because they are simpler devices. Serial has some cool features where you can cut and paste to and from the server. It also can log the users session and monitor the system log even when the user isn't connected. HP 16- and 48-port Serial Console Servers draw cool air in through the front door and expel warm air out through the rear. Therefore, the front door of the rack must be adequately ventilated to allow ambient room air to enter the cabinet, and the rear door must be adequately ventilated to allow warm air to escape from the cabinet. Do not block.

• 18, 34 or 50 Console Management Ports
• Modular design supports RS232 RJ45 and USB 3.0 Interfaces
• Dual 10/100/1000 Ethernet connection for always-on redundant copper and SFP fiber network access with automatic failover when primary link goes down
• Optionally integrated 4G LTE Cellular (with failback support), WiFi or V.92 modem for multiple alternate access methods when the network is down
• Built-inCentralized Management Software consolidates network and IT infrastructure into a single application for access and visibility.
• Advanced AAA security and SSH/SSL encryption to meet all data center compliance policies and seamless integration with your existing IT & network management systems

Select your Console Server:

Perle's built-inClustering Software centralizes all your network and IT infrastructure into a single application and provides secure reliable access and visibility during normal operations and critical network failures.

Perle Console Servers are compatible with Cisco switches, routers and firewallls. Straight cabling to Cisco devices saves time and money during install.

Choose a Console Server that is made from certified components with high MTBF rates that can withstand the harshest environments. An open source platform and enterprise grade security ensures you have the best value in one box. In addition, we provide the best-in-class Lifetime Warranty.

Perle Secure Console Servers support all AAA security services used in corporate networks, including TACACS+, RADIUS, LDAP, Kerberos, NIS and RSA. And, to further protect ID’s and passwords from someone ‘snooping’ on the network, SSH/SSL, IPSec VPN, SNMPv3, Telnet and HTTPS secure management sessions are supported.

If you need a technical consultation (by phone or email) to help you choose the best Console Server for your application, Perle is easy to reach and has technical engineers you can talk to. We have sales and technical support staff around the globe to support you when you need it.

Perle has been providing reliable device connectivity solutions since 1976. That’s over 40 years of experience that businesses around the globe have come to trust to deliver superior connectivity technology for mission critical applications. If network uptime is vitally important to your success, choose quality products. Choose Perle.

The Serial Console in the Azure portal provides access to a text-based console for Windows virtual machines (VMs) and virtual machine scale set instances. This serial connection connects to the COM1 serial port of the VM or virtual machine scale set instance, providing access to it independent of the network or operating system state. The serial console can only be accessed by using the Azure portal and is allowed only for those users who have an access role of Contributor or higher to the VM or virtual machine scale set.

Serial Console works in the same manner for VMs and virtual machine scale set instances. In this doc, all mentions to VMs will implicitly include virtual machine scale set instances unless otherwise stated.

For serial console documentation for Linux, see Azure Serial Console for Linux.

Note

The Serial Console is generally available in global Azure regions. It is not yet available in Azure government or Azure China clouds.

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Prerequisites

• Your VM or virtual machine scale set instance must use the resource management deployment model. Classic deployments aren't supported.

• Your account that uses serial console must have the Virtual Machine Contributor role for the VM and the boot diagnostics storage account

• Your VM or virtual machine scale set instance must have a password-based user. You can create one with the reset password function of the VM access extension. Select Reset password from the Support + troubleshooting section.

• The VM for virtual machine scale set instance must have boot diagnostics enabled.

Enable Serial Console functionality for Windows Server

Note

If you are not seeing anything in the serial console, make sure that boot diagnostics is enabled on your VM or virtual machine scale set.

Enable the serial console in custom or older images

Newer Windows Server images on Azure have Special Administration Console (SAC) enabled by default. SAC is supported on server versions of Windows but isn't available on client versions (for example, Windows 10, Windows 8, or Windows 7).

For older Windows Server images (created before February 2018), you can automatically enable the serial console through the Azure portal's run command feature. In the Azure portal, select Run command, then select the command named EnableEMS from the list.

Alternatively, to manually enable the serial console for Windows VMs/virtual machine scale set created before February 2018, follow these steps:

1. Connect to your Windows virtual machine by using Remote Desktop

2. From an administrative command prompt, run the following commands:

   • bcdedit /ems {current} on
   • bcdedit /emssettings EMSPORT:1 EMSBAUDRATE:115200

3. Reboot the system for the SAC console to be enabled.

If needed, the SAC can be enabled offline as well:

1. Attach the windows disk for which you want SAC configured as a data disk to the existing VM.

2. From an administrative command prompt, run the following commands:

   • bcdedit /store <mountedvolume>bootbcd /ems {default} on
   • bcdedit /store <mountedvolume>bootbcd /emssettings EMSPORT:1 EMSBAUDRATE:115200

How do I know if SAC is enabled?

If SAC isn't enabled, the serial console won't display the SAC prompt. In some cases, VM health information is shown, and in other cases it's blank. If you're using a Windows Server image created before February 2018, SAC probably won't be enabled.

Enable the Windows boot menu in the serial console

If you need to enable Windows boot loader prompts to display in the serial console, you can add the following additional options to your boot configuration data. For more information, see bcdedit.

1. Connect to your Windows VM or virtual machine scale set instance by using Remote Desktop.

2. From an administrative command prompt, run the following commands:

   • bcdedit /set {bootmgr} displaybootmenu yes
   • bcdedit /set {bootmgr} timeout 10
   • bcdedit /set {bootmgr} bootems yes

3. Reboot the system for the boot menu to be enabled

Note

The timeout that you set for the boot manager menu to display will impact your OS boot time. If you think the 10-second timeout value is too short or too long, set it to a different value.

Use Serial Console

Use CMD or PowerShell in Serial Console

1. Connect to the serial console. If you successfully connect, the prompt is SAC>:

2. Enter cmd to create a channel that has a CMD instance.

3. Enter ch -si 1 or press <esc>+<tab> shortcut keys to switch to the channel that's running the CMD instance.

4. Press Enter, and then enter sign-in credentials with administrative permissions.

5. After you've entered valid credentials, the CMD instance opens.

6. To start a PowerShell instance, enter PowerShell in the CMD instance, and then press Enter.

Use the serial console for NMI calls

A non-maskable interrupt (NMI) is designed to create a signal that software on a virtual machine won't ignore. Historically, NMIs have been used to monitor for hardware issues on systems that required specific response times. Today, programmers and system administrators often use NMI as a mechanism to debug or troubleshoot systems that are not responding.

The serial console can be used to send an NMI to an Azure virtual machine by using the keyboard icon in the command bar. After the NMI is delivered, the virtual machine configuration will control how the system responds. Windows can be configured to crash and create a memory dump file when receiving an NMI.

For information on configuring Windows to create a crash dump file when it receives an NMI, see How to generate a crash dump file by using an NMI.

Use function keys in serial console

Function keys are enabled for usage for serial console in Windows VMs. The F8 in the serial console dropdown provides the convenience of easily entering the Advanced Boot Settings menu, but serial console is compatible with all other function keys. You may need to press Fn + F1 (or F2, F3, etc.) on your keyboard depending on the computer you are using serial console from.

Use WSL in serial console

Black Box Serial Server

The Windows Subsystem for Linux (WSL) has been enabled for Windows Server 2019 or later, so it is also possible to enable WSL for use within the serial console if you are running Windows Server 2019 or later. This may be beneficial for users that also have a familiarity with Linux commands. For instructions to enable WSL for Windows Server, see the Installation guide.

Restart your Windows VM/virtual machine scale set instance within Serial Console

You can initiate a restart within the serial console by navigating to the power button and clicking 'Restart VM'. This will initiate a VM restart, and you will see a notification within the Azure portal regarding the restart.

This is useful in situations where you may want to access the boot menu without leaving the serial console experience.

Disable the Serial Console

By default, all subscriptions have serial console access enabled. You can disable the serial console at either the subscription level or VM/virtual machine scale set level. For detailed instructions, visit Enable and disable the Azure Serial Console.

Serial console security

Access security

Access to the serial console is limited to users who have an access role of Virtual Machine Contributor or higher to the virtual machine. If your Azure Active Directory tenant requires multi-factor authentication (MFA), then access to the serial console will also need MFA because the serial console's access is through the Azure portal.

Channel security

All data that is sent back and forth is encrypted on the wire.

Audit logs

All access to the serial console is currently logged in the boot diagnostics logs of the virtual machine. Access to these logs are owned and controlled by the Azure virtual machine administrator.

Caution

No access passwords for the console are logged. However, if commands run within the console contain or output passwords, secrets, user names, or any other form of personally identifiable information (PII), those will be written to the VM boot diagnostics logs. They will be written along with all other visible text, as part of the implementation of the serial console's scroll back function. These logs are circular and only individuals with read permissions to the diagnostics storage account have access to them. However, we recommend following the best practice of using the Remote Desktop for anything that may involve secrets and/or PII.

Concurrent usage

Linux Serial Console

If a user is connected to the serial console and another user successfully requests access to that same virtual machine, the first user will be disconnected and the second user connected to the same session.

Caution

This means that a user who's disconnected won't be logged out. The ability to enforce a logout upon disconnect (by using SIGHUP or similar mechanism) is still in the roadmap. For Windows, there's an automatic timeout enabled in SAC; for Linux, you can configure the terminal timeout setting.

Accessibility

Accessibility is a key focus for the Azure serial console. To that end, we've ensured that the serial console is accessible for the visual and hearing impaired, as well as people who might not be able to use a mouse.

Keyboard navigation

Use the Tab key on your keyboard to navigate in the serial console interface from the Azure portal. Your location will be highlighted on screen. To leave the focus of the serial console window, press Ctrl+F6 on your keyboard.

Use the serial console with a screen reader

The serial console has screen reader support built in. Navigating around with a screen reader turned on will allow the alt text for the currently selected button to be read aloud by the screen reader.

Common scenarios for accessing the serial console

Windows Serial Console Terminal

Known issues

We're aware of some issues with the serial console and the VM's operating system. Here's a list of these issues and steps for mitigation for Windows VMs. These issues and mitigations apply for both VMs and virtual machine scale set instances. If these don't match the error you're seeing, see the common serial console service errors at Common Serial Console errors.

Frequently asked questions

Q. How can I send feedback?

A. Provide feedback by creating a GitHub issue at https://aka.ms/serialconsolefeedback. Alternatively (less preferred), you can send feedback via azserialhelp@microsoft.com or in the virtual machine category of https://feedback.azure.com.

Watch tv shows online free no downloads. Q. Does the serial console support copy/paste?

A. Yes. Use Ctrl+Shift+C and Ctrl+Shift+V to copy and paste into the terminal.

Q. Who can enable or disable the serial console for my subscription?

A. To enable or disable the serial console at a subscription-wide level, you must have write permissions to the subscription. Roles that have write permission include administrator or owner roles. Custom roles can also have write permissions.

Q. Who can access the serial console for my VM?

A. You must have the Virtual Machine Contributor role or higher for a VM to access the VM's serial console.

Q. My serial console isn't displaying anything, what do I do?

A. Your image is likely misconfigured for serial console access. For information about configuring your image to enable the serial console, see Enable the serial console in custom or older images.

Q. Is the serial console available for virtual machine scale sets?

A. Yes, it is! See Serial Console for Virtual Machine Scale Sets

Next steps

Serial Console Server

• For an in-depth guide to CMD and PowerShell commands you can use in the Windows SAC, see Windows commands: CMD and PowerShell.
• The serial console is also available for Linux VMs.
• Learn more about boot diagnostics.