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Which servers does PRTG connect to for Software Auto-Update, Activation, etc.?

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The machine running our PRTG core server does not have full internet access. Which URLs do I need to make available to the core server so I can use the auto-update functionality and automatic software activation? Are there sensor types which connect to external sources?

activation auto-update domains email external images privacy prtg update-check urls

Created on Feb 21, 2012 10:30:34 AM by  Daniel Zobel [Paessler Support]

Last change on May 24, 2016 4:08:40 PM by  Gerald Schoch [Paessler Support]



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This article applies to PRTG Network Monitor 16 or later

PRTG Connections to External Servers

PRTG needs to connect to several external servers for full functionality. These connections are required for several purposes, such as PRTG updates and licensing, for notifications, and for monitoring with certain sensor types.

Please see the table below for external servers which PRTG tries to reach, depending on your PRTG usage.

PRTG Auto-Update

To use PRTG's Auto-Update the machine running the PRTG core server needs internet access (either direct, or via proxy) to different (sub-) domains so update check and download can work correctly:

(Sub-) DomainProtocolPort #Remarks
autoupdate.paessler.comhttps443IP 62.146.25.20*
updatecheck.paessler.comhttp80IP 62.146.25.20*
download.paessler.comhttp80IP 62.146.25.20*
downloads.paessler.comhttp80Hosted on Cloudflare
download-cdn.paessler.comhttp80Hosted on Amazon
download-s3-eu.paessler.com.s3.amazonaws.comhttp80Hosted on Amazon

*Note: Because the IP addresses can change dynamically, we do not recommend to apply policies based on IP. Please understand that we cannot provide IP addresses for Amazon servers.

PRTG License Activation

Software activation is a one-time process necessary for all installations running with a license key. PRTG will try to automatically activate every installation on first start-up. In order for this to work, the machine running the PRTG core server needs internet access (either direct, or via proxy) to at least one of the following (sub-) domains:

(Sub-) DomainProtocolPort #Remarks
activation.paessler.comhttps443IP 62.146.25.20
activation1.paessler.comhttps443IP 62.146.25.20
activation2.paessler.comhttps443IP 62.146.25.20
activation3.paessler.comhttps443IP 62.146.25.20
activation1.paessler.aghttps443IP 62.146.25.20
activation1.paessler.euhttps443IP 62.146.25.20

Note: Because the IP addresses can change dynamically, we do not recommend to apply policies based on IP.

HTML Emails

When you receive emails from PRTG which are created using the PRTG default HTML email templates, your email client may try to connect to the Paessler server to download images (for example, colored sensor icons). To be able to view these emails properly, please allow your email client to get the images from our server.

(Sub-) DomainProtocolPort #
prtgicons.paessler.comhttp80

Emails from Paessler directly come from mailserver.paessler.com with IP 62.146.75.210

Sensors

Several sensor types need to connect to external servers to show monitoring data. Please ensure that the probe system(s) on which you run such sensors can reach the target domains.

External SourceSensors and Remarks
*.amazonaws.comAmazon CloudWatch sensors: The first part of the domain depends on your region and configuration.
https://api.prtgcloud.com:443Cloud HTTP and Cloud Ping sensors
http://windowsupdate.microsoft.com and other Windows update domainsWindows Updates Status (Powershell) sensor (if WSUS is not available)
Automatic Root Certificates Updates (via Akamai CDN)SSL secured sensor connections (see this article)
DNS serversDNS resolution for several sensor types (see How DNS query works on Microsoft TechNet)

Notifications

External SourceNotification Type
*.amazonaws.comAmazon SNS notification: The first part of the domain depends on your region and configuration.
https://api.prtgcloud.com:443Push notification

SMS Notifications

Please see this article for the URLs which PRTG uses for the preconfigured SMS providers:

Geo Maps

Please see this article for the URLs which PRTG uses for the Geo Maps providers:

Support Bundles

You can send support request and support bundles using the Contact Support form in PRTG. PRTG will transmit these requests securely to Paessler via the PRTG Cloud. Please make sure your PRTG server has access to the internet and can reach the following URL.

DomainProtocolPort #URL
api.prtgcloud.comhttps443https://api.prtgcloud.com:443
amazonaws.com*.s3.amazonaws.com

See Also

Created on Feb 21, 2012 11:16:01 AM by  Daniel Zobel [Paessler Support]

Last change on Feb 9, 2017 12:02:42 PM by  Gerald Schoch [Paessler Support]



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Would it be possible to provide a range of IP addresses/subnets of the above-mentioned servers? Applying policy based on domain names and a subsequent resolution has a severe impact on our enterprise firewall performance.

Thanks,

Martin Klepac

Created on Mar 4, 2016 10:06:37 AM by  klepam (0) 1



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Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.