SSL_write() failed (55: No buffer space available) while proxying upgraded connection

[Sergey A. Osokin]

Hi Johan,

hope you're doing well thse days.

On Wed, Nov 03, 2021 at 02:59:15PM -0400, johan.belin wrote:
> I am a beginner so I am sorry for lacking info or stupid questions!
> Building a WebRTC streaming media system based on mediasoup, the server runs
> on a MacMini M1 in node, nginx port forwards to 8400. We are doing load
> tests and at 120 connected clients nginx gives the following error message:
>
> 2021/11/03 19:10:07 [crit] 282#0: *659 SSL_write() failed (55: No buffer
> space available) while proxying upgraded connection, client: 35.187.32.242,
> server: idol.activeent.co, request: "GET /idol-server/ HTTP/1.1", upstream:
> "https://127.0.0.1:8400/", host: "idol.activeent.co"

It seems like the network stack requires some tuning for such load testing.

> Then after that there is another error
> 2021/11/03 19:10:11 [alert] 282#0: *771 socket() failed (24: Too many open
> files) while connecting to upstream, client: 23.251.143.177, server:
> idol.activeent.co, request: "GET /idol-server/ HTTP/1.1", upstream:
> "https://127.0.0.1:8400/", host: "idol.activeent.co"

Same here.

> Any suggestions what it can be and what to do about it?

Some of those network settings are required knowledge about the operating
system and its version, network connectivity, hardware, including but not
limited to memory, CPU and disk.

-- 
Sergey Osokin