Solidworks Host File Block Install !new! ⭐ Legit

Title: A Reliable Workaround for Installation Issues, But Not a Silver Bullet

Rating: ⭐⭐⭐⭐ (4/5)

The Bottom Line: Editing the host file to block SolidWorks server connections is a highly effective method for resolving specific installation hang-ups and "cannot connect to server" errors, particularly for standalone installations or network license issues. However, it is technically a workaround rather than an official fix, and it requires precise syntax to avoid breaking the installation entirely.

Pros:

Solves the "Infinite Spin": Successfully resolves the common issue where the installation manager hangs indefinitely while trying to "retrieve product information" from SOLIDWORKS servers.
Bypasses Server Outages: Useful when SOLIDWORKS activation servers are temporarily down or experiencing regional connectivity issues.
No Third-Party Software: Unlike "stress relief" tools often found on forums, this method uses built-in OS functionality (the hosts file), making it cleaner and safer.

Cons:

Breaks Automatic Updates: By blocking the domains, the SolidWorks Installation Manager can no longer check for updates or service packs. You must download full installers manually from the customer portal.
Syntax Sensitive: A common mistake is forgetting that one wrong IP entry or missing # comment can cause the license manager to fail entirely.
Antivirus Flags: Some aggressive antivirus software (and SolidWorks' own telemetry) may detect the host file modification as "suspicious activity" and block the install anyway.

Detailed Experience: I utilized the host file block method during a fresh install of SolidWorks 2024 on a high-security corporate network. The standard installation manager failed repeatedly at the "Initializing" stage due to firewall restrictions blocking callbacks to swdm.solidworks.com and activation.solidworks.com.

By mapping these domains to 127.0.0.1 in the Windows etc/hosts file, the installation manager immediately skipped the online check and allowed the install to proceed from local files.

Crucial Tip for Users: If you are using this method for a Network License (SNL) setup, be extremely careful not to block your internal license server address. Only block the external SOLIDWORKS validation addresses. Additionally, remember to remove the entries from the host file after the installation is complete if you want the software to successfully validate the license upon the first launch.

Final Verdict: This is a necessary skill for any IT admin managing SolidWorks deployments in restricted environments. It is not a "fix-all" for every installation error, but for connectivity-related stalls, it works 100% of the time. Just remember to undo the changes post-install to ensure your license validation remains healthy.

The SOLIDWORKS Installation Manager or 3DEXPERIENCE Launcher can be blocked if it lacks permission to modify the Windows hosts file

or if security software prevent access to it. This often results in "Permission Denied" errors or connectivity issues where the installer cannot reach the required license or download servers. SOLIDWORKS Forums Troubleshooting Hosts File Blocks

If your installation is failing due to hosts file issues, follow these steps to resolve the block: Disable Antivirus Interference

: Many antivirus programs (such as Webroot, ZoneAlarm, or SentinelOne) actively "lock" the hosts file to prevent malware from hijacking it.

: Uncheck "Prevent any program from modifying the HOSTs file". : Go to Advanced Settings and uncheck "Lock Hosts File". Check File Attributes : Ensure the hosts file itself is not set to "Read-only". Navigate to C:\Windows\System32\drivers\etc Right-click the file and select Properties Run as Administrator

: The installer requires elevated permissions to write to system files. Right-click your and select Run as Administrator Manual DNS Workaround

: If the installer still cannot connect to license servers, you may need to manually add the server's IP and name to the hosts file. as an Administrator. Open the file at C:\Windows\System32\drivers\etc\hosts Add a new line with the [IP Address] [Server Name] 192.168.1.100 MyPDMServer Save the file and run ipconfig /flushdns in a Command Prompt. SOLIDWORKS Forums Other Common "Blocks" Sometimes the installer appears "blocked" (e.g., a blank white screen

) not because of the hosts file, but because Windows has blocked the downloaded installation files. Unblock Zip/Exe : Right-click the downloaded SOLIDWORKS zip or Properties , and click the button at the bottom. Firewall Exceptions

: Ensure your firewall allows outbound TCP connections on port 80 for sldimdownloader.exe www.javelin-tech.com Are you seeing a specific error code like "Permission Denied" or a blank screen when the installer launches?

🛠️ Troubleshooting: SOLIDWORKS Installation Blocked by Hosts File

If you are seeing errors like "Could not connect to the SOLIDWORKS server" or the Installation Manager hangs during the pre-check, your Windows hosts file might be blocking essential communication. Why is this happening?

The hosts file is used by Windows to map specific hostnames to IP addresses. Sometimes, security software or previous manual edits add entries that "blackhole" (redirect to 127.0.0.1) SOLIDWORKS licensing or update domains, preventing the installer from verifying your serial number. How to Fix It:

Locate the File: Open File Explorer and go to:C:\Windows\System32\drivers\etc\ solidworks host file block install

Open as Admin: Right-click hosts and open it with Notepad (ensure you run Notepad as an Administrator, or you won't be able to save).

Identify Blocks: Look for any lines containing solidworks.com or im-ak.solidworks.com. Example of a blocked line: 127.0.0.1 im-ak.solidworks.com

Clean Up: Delete those lines or add a # at the beginning of the line to comment them out.

Save & Flush: Save the file. Then, open Command Prompt and type ipconfig /flushdns to clear your cache.

Pro-Tip: If the installer still fails, ensure your firewall isn't doing the same job the hosts file was doing! You can also manage background updates through the SOLIDWORKS Installation Manager to ensure everything is running smoothly.

Blocking SolidWorks Installation using Hosts File

The hosts file is a system file used to map hostnames to IP addresses. It can be used to block or redirect access to specific websites or servers. In this write-up, we will explore how to block the installation of SolidWorks by modifying the hosts file.

Why Block SolidWorks Installation?

There may be several reasons why you want to block the installation of SolidWorks on a computer:

Licensing restrictions: You may not have a valid license to use SolidWorks, and you want to prevent unauthorized installations.
Bandwidth conservation: SolidWorks installation files are large, and you may want to conserve bandwidth by preventing downloads.
Security: You may want to prevent the installation of software that could potentially compromise the security of your system.

Modifying the Hosts File

The hosts file is located in different directories depending on the operating system:

Windows: C:\Windows\System32\drivers\etc\hosts
macOS/Linux: /etc/hosts

To block the installation of SolidWorks, you need to add entries to the hosts file that redirect the SolidWorks installation servers to a non-existent or local IP address.

SolidWorks Installation Servers

The following servers are used during the SolidWorks installation process:

https://install.solidworks.com
https://www.solidworks.com
https://api.solidworks.com

Blocking SolidWorks Installation

Add the following lines to your hosts file:

127.0.0.1 install.solidworks.com
127.0.0.1 www.solidworks.com
127.0.0.1 api.solidworks.com

0.0.0.0 install.solidworks.com
0.0.0.0 www.solidworks.com
0.0.0.0 api.solidworks.com

Save the changes to the hosts file.

Testing the Block

To test if the SolidWorks installation is blocked, try to download and install SolidWorks. The installation process should fail or be redirected.

Reverting the Changes

If you want to allow the installation of SolidWorks, simply remove the entries you added to the hosts file.

Conclusion

Modifying the hosts file is a simple and effective way to block the installation of SolidWorks. This method can be used to control access to specific software or websites. However, it is essential to note that this method can be bypassed by using alternative installation methods or by modifying the hosts file itself.

Additional Considerations

Administrative privileges: Modifying the hosts file requires administrative privileges.
File permissions: Ensure that you have the necessary permissions to modify the hosts file.
System configuration: The hosts file is a system file, and modifying it may affect other system functions.

Best Practices

Document changes: Document any changes made to the hosts file.
Test thoroughly: Test the changes thoroughly to ensure they do not affect other system functions.
Revert changes: Revert any changes made to the hosts file when they are no longer needed.

If you are looking for the specific entries to add to your Windows hosts file to prevent SOLIDWORKS from communicating with license validation servers during an installation or startup, you typically use the following lines. Hosts File Entries

To block these connections, copy and paste the following text into your hosts file:

127.0.0.1 im.solidworks.com 127.0.0.1 ext-im.solidworks.com 127.0.0.1 activate.solidworks.com 127.0.0.1 ext-activate.solidworks.com 127.0.0.1 standard.solidworks.com Use code with caution. Copied to clipboard How to Edit the File Open Notepad as Administrator

: Search for "Notepad" in the Start menu, right-click it, and select Run as Administrator Navigate to the Folder File > Open and paste this path: C:\Windows\System32\drivers\etc

Note: Change the file type filter in the bottom right from "Text Documents ( .txt)" to "All Files ( )" to see the file.* Open 'hosts' : Select the file named (it has no extension). Add the Text

: Scroll to the bottom, paste the entries above on new lines, and save the file. Rackspace Technology

Blocking these hosts is often done to bypass "Checking for Updates" delays or for troubleshooting license manager connectivity in private networks. If you are experiencing an "Installation failed" error, you may also need to repair the installation through the Windows Control Panel. Are you trying to resolve a specific error code during the installation process?

The phrase "SolidWorks host file block install" typically refers to two distinct technical scenarios: using the Windows hosts file to resolve server connection issues during a legitimate networked installation (such as PDM or SolidNetWork License Manager), or using it to prevent the software from "phoning home" to activation servers. 1. Using the Hosts File for Legitimate Installations

When installing SolidWorks in a professional environment, the client machine must often communicate with a license or PDM server. If your local network's DNS cannot resolve the server's name to its IP address, the installation or software launch may fail. How to Configure the Hosts File for Server Access:

Locate the File: Navigate to C:\Windows\System32\drivers\etc\.

Run as Administrator: You must open Notepad as an Administrator to save changes to this file.

Add Server Entries: Underneath any existing text, add a new line with the server's IP address, a tab or space, and then the server name (e.g., 192.168.1.100 MyPDMSever).

Refresh DNS: Open a Command Prompt and type ipconfig /flushdns to ensure Windows recognizes the manual override. 2. Blocking Connections via the Hosts File

Some users attempt to block SolidWorks from reaching its official activation or update servers by redirecting those domain names to an invalid IP address, such as 127.0.0.1 (localhost) or 0.0.0.0. This is sometimes used in unofficial installation guides to prevent the software from verifying license keys against Dassault Systèmes' databases.

Commonly Blocked Domains (Proceed with Caution):While specific "block lists" change, they often target domains like: im.solidworks.com im-ak.solidworks.com dl-ak.solidworks.com 3. Troubleshooting "Blocked" Installations

If your legitimate installation is being blocked, it may not be the hosts file at all. Common culprits include: CurrentWare How to Block Websites Using the Hosts File on Windows 10/11 Title: A Reliable Workaround for Installation Issues, But

Mastering the SolidWorks Host File Block Install: A Complete Guide to License Management

Introduction: The Perpetual Licensing Dilemma

SolidWorks is the gold standard for 3D CAD design, used by millions of engineers and designers worldwide. However, one of the most common pain points for IT administrators and power users is managing the software’s constant attempts to "phone home." Whether you are running a legitimate standalone license, managing a network license server, or troubleshooting a failed installation, you have likely encountered the term: SolidWorks host file block install.

But what does this actually mean? Is it about piracy? (Spoiler: No.) And how does editing a simple text file on your Windows operating system solve complex licensing errors?

In this 2,500+ word guide, we will dissect every layer of the SolidWorks host file block. We will cover why you need to do it, how to do it correctly (step-by-step), common errors, and advanced troubleshooting for network licenses.

SolidWorks License & Activation Servers

127.0.0.1 activation.solidworks.com 127.0.0.1 lic.solidworks.com 127.0.0.1 license.solidworks.com 127.0.0.1 licensing.solidworks.com 127.0.0.1 solidworks.com.licensing.com 127.0.0.1 swx.licensing.solidworks.com 127.0.0.1 lmtag.service-now.com 127.0.0.1 solidworks-license.com

⚠️ Important legal/technical warnings

Do not use this to avoid buying a license.
Blocking servers may break legitimate features (e.g., Toolbox updates, online help, license borrowing).
Some SolidWorks versions will detect host file tampering and refuse to run.
For network licenses, blocking the client from reaching the license manager will cause SolidWorks to fail immediately.

If you have a valid standalone license and want to disable online checks for a fully offline machine, consult your IT admin or SolidWorks reseller first — they can guide you on proper offline activation methods.

Blocking specific host addresses is a common method for troubleshooting network licensing issues or preventing unwanted communication during a SOLIDWORKS installation. This is typically done by editing the Windows hosts file to redirect hostnames to a non-existent or local IP address. 1. Access the Windows Hosts File

The hosts file is a protected system file. You must use an administrator account to modify it. Open the Start Menu and type Notepad. Right-click Notepad and select Run as Administrator. In Notepad, go to File > Open.

Navigate to the following directory: C:\Windows\System32\drivers\etc\.

Change the file type filter in the bottom-right corner from "Text Documents (.txt)" to **All Files (.*)** to see the hosts file. Select the file named hosts (no extension) and click Open. 2. Add Block Entries

To "block" a hostname, you map it to 0.0.0.0 or 127.0.0.1 (the local loopback address), which prevents the computer from reaching the actual server.

Scroll to the bottom of the file, past any lines starting with #. Add a new line for each address you want to block. Format: [IP Address] [Hostname]

Example to block a specific server: 0.0.0.0 im.solidworks.com Example for local licensing: 127.0.0.1 [Your_Server_Name]. Save the file (Ctrl + S) and close Notepad. 3. Apply Changes (Flush DNS)

After saving the file, you must clear your computer's DNS cache so it recognizes the new rules immediately. Open the Command Prompt (type cmd in the Start menu).

Type the following command and press Enter:ipconfig /flushdns. 4. Troubleshooting Common Blocks

If the installation still fails or communication persists, check these common hurdles:

Antivirus Interference: Some security software (e.g., ZoneAlarm, Webroot) specifically locks the hosts file to prevent unauthorized changes. You may need to disable "Lock Hosts File" in your antivirus settings.

Read-Only Attribute: If you cannot save the file, right-click the hosts file in File Explorer, select Properties, and ensure Read-only is unchecked.

Firewall Rules: For license manager issues, blocking the host file may not be enough; you might need to create inbound/outbound rules in Windows Defender Firewall for ports 25734 and 25735.

Blank Installer Screen: If the installer window is white/blank, this is usually caused by Windows blocking HTML files in the installation media. Right-click the installation folder or setup.exe and select Unblock in the Properties menu. How to Configure the SOLIDWORKS PDM Local HOSTS file

Step 2: Open the Hosts File for Editing

Press Windows + R, type notepad, but do not press Enter yet.
Right-click on Notepad in the search results and select Run as administrator.
In Notepad, go to File > Open and navigate to: C:\Windows\System32\drivers\etc\
Change the file filter from Text Documents (*.txt) to All Files (.).
Select the hosts file and click Open.

The Online-Only Reality

Newer versions of SolidWorks (2023 onward, cloud-connected) require periodic online checks. If you block the host file, the software may refuse to launch entirely, displaying: "Unable to connect to the 3DEXPERIENCE Platform." Solves the "Infinite Spin": Successfully resolves the common