Sudden onset of ENOTFOUND when trying to access from fetch

1

Since yesterday (where I didn’t make any changes to the container image), whenever I spin up a machine with docker image, and try to access it, I get ENOTFOUND

[cause]: [Error: getaddrinfo ENOTFOUND szqyxfya2jyu2nuglben1.fly.dev] {
errno: -3008,
code: ‘ENOTFOUND’,
syscall: ‘getaddrinfo’,
hostname: ‘szqyxfya2jyu2nuglben1.fly.dev’
}

Accessing it from the browser works. Any ideas? I didn’t change anything.

EDIT:

It seems like it resolves after a few minutes and becomes accessible, but it wasn’t like that before, previously it became available WAY MORE faster..what could it be?

2

where are you running the code that prints this error?

3

Vercel, but it happens locally too.

It’s super odd -
If I “revalidate” (access that url) from postman web, then try to re-run this fetch from Vercel/my local machine - it works.

4

Any ideas? @lillian

I was trying to debug this the entire day, we changed nothing in our infra/code, just started happening out of nowhere

5

sorry, I didn’t have time to look at this today. it might be possible that there is some unusual delay introduced in our infra, but I don’t immediately see anything.

it’s possible that you are querying the domain just slightly too fast, and the few minutes that it takes to work again is your resolver caching a negative response. could you try sleeping a short amount of time between allocating IPs and resolving the domain?
that might fix your issue.

6

Just found the cause :sob:

I am querying the domain 100+ times to retrieve files (its a server the expose an api) and I guess there’s a rate limit / I am being blocked for doing that :expressionless_face:

Could that be the problem?

7

it shouldn’t be! you can query your app as much as you want, and if there were ratelimits they wouldn’t show up as DNS errors like that.

8

Well, it got resolved when I remove that code. I can dm it you so you can maybe take a look, but yeah that’s super weird :open_mouth:

9

weird! sure, send me an email and I’ll see if I notice anything. or if you have a a support plan, the folks over there should be able to help.

10

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