Solidworks: Host File Block

The most common payload in engineering cracks today is ransomware. You block the host file thinking you are saving $5,000 on a license. A week later, all your personal files and client drawings are encrypted, and you must pay $10,000 in Bitcoin to get them back.

If you are reading an old tutorial from 2018 or 2020, the classic host file block will not work for SolidWorks 2023 SP2.0 or newer. Here is why:

If you are considering using a HOSTS file block to run pirated SolidWorks, you need to understand the modern dangers:

If you are trying to control SolidWorks’ network behavior for legitimate reasons, use proper tools instead of the hosts file.

If you are troubleshooting or studying how this works, here is the technical process. Do not do this to avoid paying for software.

In a typical piracy tutorial, you will see lines like this:

127.0.0.1 localhost
0.0.0.0 solidworks.com
0.0.0.0 licenses.solidworks.com
0.0.0.0 register.solidworks.com
0.0.0.0 activation.solidworks.com
0.0.0.0 geometricglobal.com
0.0.0.0 solidworkslicense.com

The hosts file is a crude, partially effective, and high-maintenance method to block SolidWorks network traffic. It is widely documented in piracy circles but carries legal, operational, and technical drawbacks. For any professional environment, use proper firewall rules, software configuration, or accept the telemetry as part of the licensed software agreement.

Final recommendation: Do not rely on host file blocking for license circumvention. Use it only in controlled, legitimate scenarios (e.g., stopping crash reports from leaving an air-gapped engineering PC).

Report generated for technical awareness.

The ProblemImagine a design firm, "Apex Engineering," just moved their SolidWorks licenses to a brand-new cloud server. However, five of their veteran engineers kept getting "License Server Not Found" errors. Even though the new settings were correct, their workstations kept trying to call "home" to an old, decommissioned server IP address that no longer existed.

The DiscoveryThe IT lead, Sarah, realized the issue wasn't the software—it was the Windows Host File. This file acts like a local phone book; if it has an entry for a name (like ://apex.com), Windows won't even bother checking the internet or the network router. It just goes to the address listed in that "book." The "Block" and the Fix Solidworks Host File Block

To solve this without manually hunting down every registry key, Sarah used a Host File Block:

The Access: She opened the Windows Host File (located at C:\Windows\System32\drivers\etc\hosts) using Notepad as an Administrator.

The Redirection: She found entries pointing to the old server's IP. To "block" the software from reaching that dead end, she added a line:127.0.0.1 ://apex.com

By pointing the old server name to 127.0.0.1 (the "loopback" address), she effectively told SolidWorks: "If you try to call this old server, you’re actually just calling yourself."

The Result: SolidWorks instantly failed to find the old server on the loopback, gave up on the "bad" local info, and finally looked at the DNS settings to find the new server. Why do users do this?

While Sarah used it for a migration, many users search for "Host File Blocks" for other reasons:

Stability: Preventing the software from checking for updates in the middle of a critical project to avoid unexpected version mismatches.

Privacy: Restricting telemetry data from being sent back to the manufacturer.

Licensing: In some cases, it's used to troubleshoot "License Borrowing" bugs where a machine gets stuck trying to verify a license against a blocked port.

Are you trying to resolve a specific license error? If you let me know the exact error code or if you're trying to set up a new server, I can give you the specific steps for your version of SolidWorks.

Understanding the SolidWorks Host File Block The most common payload in engineering cracks today

The SolidWorks Host File Block is a configuration file used by SolidWorks, a popular computer-aided design (CAD) software, to manage and block access to specific files or folders on a computer. This file plays a crucial role in preventing unauthorized access to sensitive data and ensuring the security of the design and engineering process.

What is the SolidWorks Host File Block?

The SolidWorks Host File Block is a text file, typically named hosts, located in the C:\Windows\System32\drivers\etc directory on Windows operating systems. This file contains a list of IP addresses and corresponding hostnames that are blocked or redirected.

How does the SolidWorks Host File Block work?

When a user attempts to access a file or folder, SolidWorks checks the Host File Block to see if the requested resource is listed. If it is, the software will block access to that resource or redirect the user to an alternative location.

Why is the SolidWorks Host File Block important?

The SolidWorks Host File Block is essential for several reasons:

Common use cases for the SolidWorks Host File Block

Best practices for managing the SolidWorks Host File Block

By understanding the SolidWorks Host File Block and its role in maintaining data security and integrity, organizations can ensure the confidentiality, integrity, and availability of their design and engineering data.

The "SolidWorks Host File Block" is a critical networking issue typically encountered when the software cannot resolve the server name of its license or database manager. This occurs when the Windows Domain Name System (DNS) fails to translate a server name (like Workstation-01) into its numerical IP address. The hosts file is a crude, partially effective,

While often viewed as a "block," this is usually a communication breakdown that can be bypassed by manually configuring the Windows hosts file to act as a local directory. Understanding the Host File "Block"

The Windows hosts file is a plain-text document located at C:\Windows\System32\drivers\etc\. It is the first place Windows looks when trying to find a server. If there is an error in this file, or if it is intentionally blocked by security software, SolidWorks PDM or SolidNetWork License (SNL) Manager will fail to connect.

Licensing Failures: The SNL Manager communicates via ports 25734 and 25735. If the host file doesn't point to the correct server, you’ll see "Could not obtain a license for SOLIDWORKS".

PDM Connection Issues: SOLIDWORKS PDM relies heavily on server names. When DNS fails, the client machine "blocks" itself from seeing the vault until a manual entry is added to the host file.

Security Software Interference: Antivirus programs like SentinelOne, ZoneAlarm, and Webroot may lock the host file to prevent malicious changes, which inadvertently stops legitimate network troubleshooting. Step-by-Step: How to Unblock and Configure the Host File

Follow these steps to manually map your server and bypass DNS "blocks": 1. Open Notepad as Administrator You cannot edit the host file with standard permissions. Search for Notepad in the Start Menu. Right-click it and select Run as Administrator. 2. Locate the Hosts File In Notepad, go to File > Open. Navigate to: C:\Windows\System32\drivers\etc\.

Important: Change the file type filter in the bottom right corner from Text Documents (*.txt) to All Files to see the hosts file. 3. Add the Server Entry

Scroll to the bottom of the file. On a new line, type your server’s IP address, press TAB, and then type the server name. Example: 192.168.1.50 MySolidWorksServer 4. Flush the DNS Cache To ensure Windows uses your new settings immediately: Open the Command Prompt (cmd). Type ipconfig /flushdns and press Enter. Common "Host File Block" Troubleshooting

The SolidWorks Host File Block is a relic of a bygone era of software cracking. While technically simple—redirecting a few domains to 127.0.0.1—its effectiveness has dwindled to near zero for modern versions (2022+).

For the Student/Hobbyist: The risk of malware from crack sites vastly outweighs the benefit. Consider the free Altair Inspire, Fusion 360 for personal use, or the Onshape free plan instead.

For the Professional: Never use the hosts file to modify SolidWorks behavior. You are gambling your company’s legal standing and intellectual property security to save a few thousand dollars. A single Dassault audit will cost you 10x the license fee.

For the Archive: If you are maintaining an old version of SolidWorks (2019 or earlier) on an air-gapped (offline) machine, the hosts file block is technically valid. However, treat your hosts file as a sacred system file. Backup the original before editing, and sanitize any Patch.exe you download in a virtual machine first.

Ultimately, the best way to "block" SolidWorks is to pay for it. You get updates, support, cloud storage, and most importantly: peace of mind that your next design won't crash because a text file got corrupted at 2 AM.