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Colitu VPN

@colitu@mastodon.social

mastodon 5.0.0-nightly.2026-10-22

Built for networks that fight back.

Colitu is an open-source VPN engineered for privacy, security, and freedom. Powered by adaptive technology to keep you connected, even on the most restrictive networks.

Stay connected. Stay free.

colitu.com

2 Followers

1 Following

7 Posts

Joined October 09, 2026

Website:

https://colitu.com

Downloads:

https://colitu.com/en/download

Documentation:

https://docs.colitu.com/en

Open Source:

https://github.com/colitu

Colitu VPN @colitu@mastodon.social

· 2w ago

Boosted by @welcome@friends.deko.cloud

Hello, Fediverse! We're Colitu, an open-source VPN project focused on privacy, security, and reliable connectivity in challenging network environments. We believe privacy tools should be transparent, accessible, and built with the community. Here, we'll share engineering updates, technical decisions, development progress, and discussions about internet freedom. Built for networks that fight back. https://colitu.com #Introduction #OpenSource #Privacy #VPN

colitu.com

Colitu VPN — Open-Source VPN for Restricted Networks

A VPN that keeps working on restricted networks: automatic switching between Hysteria2, VLESS Reality, Trojan and Shadowsocks 2022. Open-source apps for Windows, Android, iOS and Linux. 10 GB free every month.

Colitu VPN @colitu@mastodon.social

· 1w ago

Replying to

How it happens: a speed-test server stops reading its upload but keeps the connection open. The server's write blocks, so it stops reading the stream. The unread data fills the connection's 20 MB flow-control window, and then the client can't send on any stream, not even new ones. The client can't cancel either, because its writer is stuck on the same window. UDP datagrams aren't flow-controlled, so the connection looked healthy.

Colitu VPN @colitu@mastodon.social

· 1w ago

Replying to

The fix: a write to the target that makes no progress for 10 s closes it, which releases the window. In the lab the official server never recovers and the patched one recovers in 7.8 s. On a phone, 4 speed tests over 160 s caused no stall. It's live on our servers, no app update needed. Issue: github.com/HyNetworks/hysteria/issues/1702 PR: github.com/HyNetworks/hysteria/pull/1703 Xray: github.com/XTLS/Xray-core/issues/7169 Report: lab.colitu.com/research/hysteria2-stall-after-upload

Colitu VPN @colitu@mastodon.social

· 1w ago

We believe the internet should remain open, unrestricted, and accessible to everyone.

In response to the ongoing internet disruptions in Azerbaijan, Colitu VPN is providing 30 days of completely free, unlimited access to all our VPN services for people affected.

Freedom of information and secure communication should never be a privilege.

No payment. No data limits. Just access.

#Azerbaijan #InternetFreedom #ColituVPN

Colitu VPN @colitu@mastodon.social

· 1w ago

Open development means putting engineering claims to the test.

Following a thoughtful challenge from @launchgatecheck@mastodon.social on DEV.to, we ran controlled tests on Colitu's VPN verification, fallback behavior, DNS routing, and network recovery.

We identified issues, implemented fixes, and shipped the improvements in Windows 2.8.4 and Linux 1.4.3.

The methodology, results, and limitations are public.

https://lab.colitu.com/research/route-provenance-test

#Colitu #VPN #OpenSource #NetworkSecurity

lab.colitu.com

Does the connection check really go through the tunnel?

An outside reviewer suggested a test: let the tunnel handshake succeed but drop everything inside it, and see whether the app still calls the connection verified. We ran it on the Windows and Linux apps, during fallback and across a network change, and checked app traffic and DNS too. It found three problems; all are fixed.

Colitu VPN @colitu@mastodon.social

· 1w ago

A VPN can show “connected” while traffic has silently frozen.

We built Colitu Adaptive Connect 2.0 with real-traffic checks, per-network memory, backup routing and failover-aware monitoring.

In a 60-minute controlled test on one Android device: 741/750 HTTP probes passed. A 101-second primary-server outage caused ~5 seconds of interruption.

We published the failures and limitations too.

Engineering report: https://docs.colitu.com/en/adaptive-connect-paper

#Networking #VPN #OpenSource

docs.colitu.com

Colitu Adaptive Connect 2.0 and Warm Spare: a technical report

Colitu Adaptive Connect 2.0 written up as a short research report. Server ranking, per-network memory, anonymous network hints, health check, warm spare and mid-session watching against networks that block or freeze connections, plus method, results and limitations.