Information About Http/1.1 Service Unavailable Errors On Major Networks

Posted by Sean Doyle
October 30, 2012
Updated March 13, 2025
1 min

What does Http/1.1 Service Unavailable mean?

Http/1.1 Service Unavailable is a server error. If you notice a Http/1.1 Service Unavailable error while attempting to visit a website such as YouTube.com you may be directed to a white screen that says Http/1.1 Service Unavailable.

Many social networks such as Facebook, Google, and especially YouTube crash, or require maintenance which then may prompt a series of 500 server error screens and the Service Unavailable error in discussion.

This Functionality Is Not Available Right Now

This does not mean a website was hacked, though there is always a possibility. This is typically a server error where a website may lose functionality.

Written by

Sean Doyle

Sean is a tech author and security researcher with more than 20 years of experience in cybersecurity, privacy, malware analysis, analytics, and online marketing. He focuses on clear reporting, deep technical investigation, and practical guidance that helps readers stay safe in a fast-moving digital landscape. His work continues to appear in respected publications, including articles written for Private Internet Access. Through Botcrawl and his ongoing cybersecurity coverage, Sean provides trusted insights on data breaches, malware threats, and online safety for individuals and businesses worldwide.