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upordown.online

Free website down checker & outage tracker. I write about debugging sites that won't load: DNS, TLS, HTTP and uptime.

Joined Joined on  Personal website https://upordown.online
A free uptime check with GitHub Actions that opens (and closes) an issue for you
upordownonline profile

A free uptime check with GitHub Actions that opens (and closes) an issue for you

#github #monitoring #devops #tutorial
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5 min read

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Our monitor said 100% uptime while the CDN served a 6-hour-old homepage
upordownonline profile

Our monitor said 100% uptime while the CDN served a 6-hour-old homepage

#monitoring #cdn #devops #postmortem
Comments
5 min read
Your HTTP client's default timeout is probably infinite: fix it in Python, Node, Go and curl
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Your HTTP client's default timeout is probably infinite: fix it in Python, Node, Go and curl

#webdev #python #node #go
1
Comments
4 min read
Alert after 1 failed check or 3? Tuning uptime alerts so on-call stops ignoring them
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Alert after 1 failed check or 3? Tuning uptime alerts so on-call stops ignoring them

#monitoring #sre #devops #alerting
Comments 2
4 min read
Your DNS TTL is why the outage lasted 2 hours: set it before you need it
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Your DNS TTL is why the outage lasted 2 hours: set it before you need it

#dns #devops #networking #webdev
1
Comments 1
4 min read
Ping is not an uptime check: 5 ways ICMP lies about whether your site is up
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Ping is not an uptime check: 5 ways ICMP lies about whether your site is up

#networking #devops #monitoring #webdev
Comments
4 min read
Your health check returns 200 while users get errors: 7 health check mistakes
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Your health check returns 200 while users get errors: 7 health check mistakes

#devops #monitoring #webdev #sre
Comments
5 min read
503 vs 504: what each error means and who has to fix it
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503 vs 504: what each error means and who has to fix it

#http #webdev #devops #debugging
Comments
4 min read
How to read curl -v output to find where a request fails
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How to read curl -v output to find where a request fails

#curl #debugging #networking #webdev
Comments
4 min read
How to tell if Discord, ChatGPT or any other app is down right now
upordownonline profile

How to tell if Discord, ChatGPT or any other app is down right now

#webdev #productivity #beginners #tutorial
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5 min read
How to flush DNS cache on Windows 11, macOS, Linux, Chrome and Android
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How to flush DNS cache on Windows 11, macOS, Linux, Chrome and Android

#networking #devops #beginners #tutorial
Comments
5 min read
How to fix ERR_CONNECTION_TIMED_OUT in Chrome on Windows, Mac and Android
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How to fix ERR_CONNECTION_TIMED_OUT in Chrome on Windows, Mac and Android

#webdev #networking #devops #tutorial
Comments
5 min read
How to fix DNS_PROBE_FINISHED_NXDOMAIN in Chrome (Windows, Mac, Android, iPhone)
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How to fix DNS_PROBE_FINISHED_NXDOMAIN in Chrome (Windows, Mac, Android, iPhone)

#webdev #networking #beginners #tutorial
Comments
5 min read
How to check if a website is down for everyone or just you
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How to check if a website is down for everyone or just you

#webdev #networking #beginners #tutorial
Comments
5 min read
Is it down, or is it me? Debugging a site that won't load, one layer at a time
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Is it down, or is it me? Debugging a site that won't load, one layer at a time

#networking #webdev #devops #beginners
1
Comments
4 min read
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