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Teamviewer Firewall Whitelist ((new)) Jun 2026
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Teamviewer Firewall Whitelist ((new)) Jun 2026

If port 5938 is blocked, TeamViewer will attempt to connect via HTTPS on port 443.

To ensure TeamViewer operates smoothly within a secured network, you must configure your firewall to permit specific outbound traffic. While TeamViewer is designed to work behind most firewalls without manual intervention, strict corporate environments often require explicit whitelisting (or "allowlisting") of destination ports and hostnames. Essential Firewall Ports teamviewer firewall whitelist

Remote access software like TeamViewer can be a double-edged sword. On one hand, it provides users with the flexibility to access remote devices from anywhere, at any time. On the other hand, it also introduces significant security risks if not properly configured. Unrestricted remote access can allow unauthorized users to connect to a device, potentially leading to data breaches, malware infections, and other types of cyber attacks. In fact, misconfigured TeamViewer instances have been implicated in several high-profile cyber attacks in recent years. If port 5938 is blocked, TeamViewer will attempt

Whitelisting TeamViewer correctly takes 10 minutes. Dealing with dropped remote sessions takes all week. Get this rule set up once, and your helpdesk will finally run smoothly. Unrestricted remote access can allow unauthorized users to

Instead of whitelisting by domain name (which some firewalls struggle with), whitelist the actual IP subnets. TeamViewer uses the following ranges (verify current list on their official KB, but these are the standard blocks):

Whitelisting means telling your firewall: "Do not inspect, block, or question traffic coming from TeamViewer’s official servers. Let it pass immediately."