https://supermath.inf.um.es/hss/webejs/c4f7dac9-f83b-413a-8321-626f6fc5dfd9
https://enjoy.phy.ntnu.edu.tw/Ejs/webejs/bd8d9d29-030a-4021-8cae-b03ae7dad886
https://webejs.iwant2study.org:8000/
🌐 Accessing WebEJS Servers Across Regions Using VPN
Many educators and developers working with WebEJS simulations may encounter a common issue:
👉 Some servers are restricted by university networks or geographic access policies.
In this post, we explore how to access the following WebEJS platforms even when they are region-blocked:
- https://supermath.inf.um.es/hss/webejs/
- https://enjoy.phy.ntnu.edu.tw/Ejs/webejs/
- https://webejs.iwant2study.org:8000/
🔍 Why Some WebEJS Links Don’t Load
WebEJS simulations are often hosted on university servers, such as:
- University of Murcia (Spain) →
um.es - National Taiwan Normal University →
ntnu.edu.tw
These servers may:
- Restrict access to local campus IP ranges
- Block certain countries or regions
- Limit traffic to prevent overload or misuse
A common example is the UM server (runwebejs), where access may fail outside Spain or approved regions.
🔐 Solution: Use a VPN
A VPN (Virtual Private Network) allows you to route your connection through another country.
💡 Key Idea:
If a server allows access from Spain, you can:
➡️ Connect your VPN to a Spain-based server
➡️ Reload the WebEJS link
➡️ Access is restored
🧭 Step-by-Step Guide
1. Choose a VPN Provider
Use any reliable VPN such as:
- NordVPN
- ExpressVPN
- Proton VPN (free tier available)
2. Connect to a Suitable Country
For the links above:
| Server | Recommended VPN Location |
|---|---|
um.es (Spain) | 🇪🇸 Spain |
ntnu.edu.tw (Taiwan) | 🇹🇼 Taiwan |
iwant2study.org | 🌍 Usually open globally |
3. Access the WebEJS Simulation
Once connected:
- Open your browser
- Paste the link (e.g.
runwebejs) - The simulation should now load normally
⚠️ Important Considerations
1. Performance
- VPN may slightly slow down loading
- Choose a fast server location
2. School / MOE Network
- Some networks block VPN usage
- You may need to:
- Use home network
- Or approved secure access routes
3. Security
- Avoid unknown/free VPNs with poor reputation
- Stick to trusted providers
🧠 Why This Matters for Educators
Accessing these servers allows you to:
- Use ready-made WebEJS simulations
- Test and adapt models before deploying to SLS
- Explore international repositories of physics & math interactives
This is especially useful when:
- Reusing global OSP (Open Source Physics) resources
- Supporting conceptual change pedagogy
- Rapid prototyping of simulations
🚀 Alternative (Long-Term Solution)
Instead of relying on VPN:
👉 Host simulations locally or on your own server
(e.g. webejs.iwant2study.org)
Benefits:
- No geo-blocking
- Faster access for students
- Full control over content
💡 Final Thoughts
VPN is a quick workaround, but not a permanent solution.
For scalable classroom use:
- ✅ Mirror or host simulations locally
- ✅ Integrate into SLS / LMS
- ❌ Avoid relying on external university servers during lessons
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