# Issue with ICMP Monitor

**URL:** <https://discuss.elastic.co/t/issue-with-icmp-monitor/381262>\
**Category:** Synthetics\
**Created:** [August 22, 2025, 3:29pm UTC](https://discuss.elastic.co/t/issue-with-icmp-monitor/381262 "2025-08-22T15:29:09Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![erikg](https://avatars.discourse-cdn.com/v4/letter/e/91b2a8/32.png) [@erikg](https://discuss.elastic.co/u/erikg)\
**Post date:** [August 22, 2025, 3:29pm UTC](https://discuss.elastic.co/t/issue-with-icmp-monitor/381262/1 "2025-08-22T15:29:09Z")

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Hello,

I was wondering why I am getting an error with a specific icmp monitor. I am on self managed and running on private location. Elasticsearch and kibana version 8.18.0.

For example: I only have the IP address and I placed a identifier for the monitor name:

 ![image](https://us1.discourse-cdn.com/elastic/original/3X/0/7/07d0bb024851f7ba7800804c36cedd064ea15182.png)

I am leveraging fleet managed elastic agent with synthetics integration to host this private location on a VM.

Here’s the strange part, on the actual VM (where synthetic’s private location is hosted), I pinged the ip address directly and no issues:

 ![image](https://us1.discourse-cdn.com/elastic/original/3X/9/f/9f19464d58cf2b647fb4a9efad182189b532fc6d.png)

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<div class="post-metadata">

**Author:** ![erikg](https://avatars.discourse-cdn.com/v4/letter/e/91b2a8/32.png) [@erikg](https://discuss.elastic.co/u/erikg)\
**Post date:** [August 22, 2025, 3:52pm UTC](https://discuss.elastic.co/t/issue-with-icmp-monitor/381262/2 "2025-08-22T15:52:32Z")

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I figured it out:

It seems to be a syntax issue where Synthetics ICMP monitor doesn’t recognize when an IP address contains a zero prefix:  
**X.X.01.X** → It works with Ping command

The fix → **X.X.1.X**