====== Access Check Tool ======

The Access Check tool helps you find out **why a site won't open** — from your own perspective, from inside Iran, and (when needed) from outside.

It combines checks from your browser, an Iran-based probe, and optionally an external probe and a full multi-provider DNS sweep. When you need to go deeper, it can also download a small local diagnostic script that runs on your own computer.

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===== How to Use =====

  1. Enter a URL (e.g., `example.com` or `https://example.com/path`)
  2. Click "Run Diagnostic"
  3. Review the results

Optionally, check **"Also run an advanced local diagnostic"** to download a script you can inspect before running.

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===== What It Checks =====

^ Layer ^ What It Tests ^
| **Your browser** | Whether your browser can reach the site directly |
| **Iran probe (atrin01)** | Whether the site is reachable from inside Iran |
| **External probe** | Whether the site is reachable from outside Iran (only if something looks wrong) |
| **DNS sweep** | Resolution across multiple DNS providers (only if something looks wrong) |
| **Local diagnostic** | Your DNS servers, proxy settings, ping, traceroute, and trusted root certificates |

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===== How the Checks Are Priced =====

To keep the common case cheap, the tool runs checks in stages:

  * **Every run** — an atrin01 (Iran) check is performed. Small fixed cost.
  * **Only if something looks wrong** — the external probe and the full DNS provider sweep run automatically.

This means a healthy site costs very little to check, and only a broken one triggers the deeper (and more expensive) investigations.

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===== The Advanced Local Diagnostic =====

When you check the box, Access Check downloads a small script to your computer. You can **read it before running it** — it is plain text.

What the script does:

  * Reads your **DNS servers**
  * Reads your **proxy settings**
  * Runs a **ping** and **traceroute** to the target
  * Lists the **root certificates** Windows trusts

What it does **not** do:

  * ❌ Does not send anything to Telenegar or anywhere else
  * ❌ Does not read private keys or passwords
  * ❌ Does not modify your system

The script writes a single file on your own computer. You choose whether to attach that file back into Access Check, where it is read **entirely inside your own browser** — it is never uploaded.

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===== Why This Matters =====

Many "site is down" problems are actually **local** — a wrong DNS server, a proxy misconfiguration, a system clock that's off, or a missing root certificate. Access Check separates local problems from real network or server problems.

For example:

  * **Reachable from Iran, not from outside** → possibly a filtering or routing issue
  * **Reachable from outside, not from Iran** → possibly a domestic filtering or routing issue
  * **Reachable from probes, not from your browser** → likely a problem on your side
  * **Not reachable from anywhere** → the site is likely genuinely down

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[[https://telenegar.ir/accesscheck/|Try the Access Check Tool →]]

{{tag>tool accesscheck diagnostics iran}}