# Networking: ping — Request timed out / 100% packet loss (host drops or filters ICMP)

**Code:** `Ping: Request timed out` · **Category:** Networking · **Seen on:** Windows, Linux, Networking

No echo reply arrived in time: the host is down, unreachable, or simply ignores ping.

## Meaning

Timeouts differ from "unreachable": nobody answered. Check whether ICMP is filtered by a firewall or cloud security group, and test the real service port (`Test-NetConnection host -Port 443`, `nc -vz`) because many hosts block ping but run fine.

## Common causes

- Host down or unplugged
- Firewall or security group blocks ICMP
- Routing problem or packet loss en route
- Wrong IP address
- Rate limiting of ICMP

## Quick fix

1. Test the service port instead of ping
2. Allow ICMP echo in the firewall/security group
3. Compare with a ping to the default gateway

## Detailed fix by platform

### Windows

1. 

```powershell
Test-NetConnection 203.0.113.10 -Port 443
ping -n 10 203.0.113.10
```


## How to diagnose

1. **Gateway ping** — Works?
2. **Port test** — Open?
3. **ICMP** — Allowed?

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Source: [WhatIsMyError](https://whatismyerror.com/errors/networking/request-timed-out-ping-icmp-blocked)