Zulip Outage History
Zulip is up right nowPingoru has recorded 15 incidents for Zulip: 6 in the last 12 months and 0 in the last 90 days.
Show as a table
| Month | Incidents | Hours with an open incident |
|---|---|---|
| April 2026 | 2 | 5 of 720 (1%) |
| May 2026 | 1 | 1 of 744 (0%) |
| June 2026 | 0 | 0 of 720 (0%) |
| July 2026 | 0 | 0 of 744 (0%) |
| August 2026 | 0 | 0 of 744 (0%) |
| September 2026 | 0 | 0 of 720 (0%) |
| October 2026 | 0 | 0 of 526 (0%) |
Incidents, newest first
Minor May 21, 2026 External images preview outage 36m Zulip Cloud
Started May 21, 2026, 06:43 PM UTC· resolved May 21, 2026, 07:19 PM UTC
- identified May 21, 2026, 06:43 PM UTC
We have identified that we are failing to serve previews of external images linked from Zulip messages.
- resolved May 21, 2026, 07:19 PM UTC
This incident has been resolved.
Critical April 22, 2026 Outage 3h 52m Zulip Cloud, Mobile Push Notification Service, Email notifications
Started Apr 22, 2026, 05:32 PM UTC· resolved Apr 22, 2026, 09:25 PM UTC
- investigating Apr 22, 2026, 05:32 PM UTC
We are currently investigating this issue.
- identified Apr 22, 2026, 05:47 PM UTC
The issue has been identified and a fix is being implemented.
- monitoring Apr 22, 2026, 06:00 PM UTC
A fix has been implemented and we are monitoring the results.
- resolved Apr 22, 2026, 09:25 PM UTC
This incident has been resolved.
Major April 1, 2026 Partial outage 53m Zulip Cloud, Mobile Push Notification Service
Started Apr 01, 2026, 12:26 AM UTC· resolved Apr 01, 2026, 01:20 AM UTC
- investigating Apr 01, 2026, 12:26 AM UTC
We are currently investigating this issue.
- monitoring Apr 01, 2026, 12:49 AM UTC
A fix has been implemented and we are monitoring the results.
- resolved Apr 01, 2026, 01:20 AM UTC
This incident has been resolved.
Critical March 26, 2026 zulip.com outage 3h 55m Zulip Cloud, Mobile Push Notification Service
Started Mar 26, 2026, 02:04 PM UTC· resolved Mar 26, 2026, 05:59 PM UTC
- investigating Mar 26, 2026, 02:04 PM UTC
We are currently investigating this issue.
- monitoring Mar 26, 2026, 02:11 PM UTC
A fix has been implemented and we are monitoring the results.
- monitoring Mar 26, 2026, 02:11 PM UTC
We are continuing to monitor for any further issues.
- resolved Mar 26, 2026, 05:59 PM UTC
This incident has been resolved.
Critical January 14, 2026 Service outage 23m Zulip Cloud, Mobile Push Notification Service, Email notifications
Started Jan 14, 2026, 06:56 AM UTC· resolved Jan 14, 2026, 07:19 AM UTC
- investigating Jan 14, 2026, 06:56 AM UTC
We've experienced a service outage, and we're investigating.
- monitoring Jan 14, 2026, 06:57 AM UTC
A fix has been implemented and we are monitoring the results.
- resolved Jan 14, 2026, 07:19 AM UTC
This incident has been resolved.
Minor December 19, 2025 Image thumbnailing delays 1h 12m Zulip Cloud
Started Dec 19, 2025, 02:01 PM UTC· resolved Dec 19, 2025, 03:13 PM UTC
- investigating Dec 19, 2025, 02:01 PM UTC
We're investigating delays generating image thumbnails.
- monitoring Dec 19, 2025, 02:05 PM UTC
We've cleared the image thumbnailing backlog, and are monitoring the fix.
- resolved Dec 19, 2025, 03:13 PM UTC
This incident has been resolved.
Minor October 20, 2025 Outgoing email outage 1h 42m Email notifications
Started Oct 20, 2025, 04:45 PM UTC· resolved Oct 20, 2025, 06:28 PM UTC
- investigating Oct 20, 2025, 04:45 PM UTC
We believe this issue to be related to AWS' ongoing global outage.
- monitoring Oct 20, 2025, 05:08 PM UTC
We have failed over our outgoing email service, and backlogged messages have completed being sent.
- resolved Oct 20, 2025, 06:28 PM UTC
This incident has been resolved.
Minor August 14, 2025 Some Apple push notifications were not sent 1h 37m Mobile Push Notification Service
Started Aug 14, 2025, 02:16 PM UTC· resolved Aug 14, 2025, 03:54 PM UTC
- identified Aug 14, 2025, 02:16 PM UTC
A very small minority of Apple push notifications failed to be delivered since Aug 13 at 03:04 UTC; overall, this was 0.04% of notifications which were affected.
- monitoring Aug 14, 2025, 03:20 PM UTC
A fix has been implemented and we are monitoring the results.
- resolved Aug 14, 2025, 03:54 PM UTC
This incident has been resolved.
Notice June 11, 2025 Incoming email outage 8h 20m
Started Jun 11, 2025, 05:22 AM UTC· resolved Jun 11, 2025, 01:42 PM UTC
- resolved Jun 11, 2025, 02:30 PM UTC
From 05:22 to 13:42 UTC, incoming email integrations (to email addresses @streams.zulipchat.com) were dropped, due to an improper configuration change during a deploy. Unfortunately, we do not have access to the bounced messages, so any incoming emails in this time frame have been lost.
Critical January 23, 2025 Zulip Cloud availability incident 3h 31m Zulip Cloud, Mobile Push Notification Service
Started Jan 23, 2025, 12:29 PM UTC· resolved Jan 23, 2025, 04:00 PM UTC
- investigating Jan 23, 2025, 12:29 PM UTC
We are currently investigating this issue.
- monitoring Jan 23, 2025, 12:57 PM UTC
A fix has been implemented and we are monitoring the results.
- resolved Jan 23, 2025, 04:00 PM UTC
This incident has been resolved.
- postmortem Jan 23, 2025, 06:45 PM UTC
Starting at 2025-01-23 09:24 UTC, Zulip Cloud began to experience an intermittent outage; users may have seen “Server error” responses when attempting to access Zulip, or slower responses if they succeeded. These intermittent effects were caused by Zulip Cloud running out of memory as it attempted to process and respond to a very small number of requests which were extremely memory-intensive. Parts of the Zulip Cloud service automatically restarted to handle this memory pressure, with varying impacts — at its worst, this caused a complete outage from 09:46 UTC to 09:55 UTC. Starting at 12:04 UTC, Zulip Cloud began to have difficulty responding to the volume of users' requests, and began serving “Server error” responses more consistently, due to being over capacity. This may have been triggered by our attempts to diagnose the memory issues; we are still investigating the contributing causes to this. This outage lasted until 12:57 UTC, when we restored service by temporarily disabling the user presence API endpoints which were contributing the most load to the system; this allowed users to load their Zulip Cloud accounts. After access patterns stabilized, we re-enabled the user presence API. At 15:50, we identified the bot messages that had caused the original out-of-memory issues, mitigated their contribution by deleting them, and conveyed that information to owners of the affected organization. This addressed the immediate risk of the intermittent outages that started the incident. We apologize for any disruption caused by this incident, and are working on addressing the underlying causes, so that this doesn’t happen again. Ongoing follow-ups: * Investigating the contributing factors which led to the over-capacity issue. * Creating a more robust solution to the memory issues which this incident uncovered. * Improving the number of links to this status page, as well as broadening who can update it, to ensure that it is updated in a more timely fashion.