# Tcp connect failing since upgrade to 8.15 on termux
**URL:** https://racket.discourse.group/t/tcp-connect-failing-since-upgrade-to-8-15-on-termux/3298
**Category:** Questions & Answers
**Created:** [November 7, 2024, 2:58am UTC](https://racket.discourse.group/t/tcp-connect-failing-since-upgrade-to-8-15-on-termux/3298 "2024-11-07T02:58:13Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@Zeb](https://racket.discourse.group/u/Zeb)
#### Post date: [November 7, 2024, 2:58am UTC](https://racket.discourse.group/t/tcp-connect-failing-since-upgrade-to-8-15-on-termux/3298/1 "2024-11-07T02:58:14Z")
I ran into this error when running raco pkg migrate 8.14. Can someone help me figure out what's going on? I can visit the host through a browser on my device. I don't have a VPN or proxy or anything. I'm on termux on Android if that matters. With racket bc.
```shell
11: Resolving "scribble-lib" via https://download.racket-lang.org/releases/8.15/catalog/
12: Resolving "threading-lib" via https://download.racket-lang.org/releases/8.15/catalog/
tcp-connect: connection failed;
host not found
address: download.racket-lang.org
port number: 443
system error: Invalid value for ai_flags; gai_err=3
context...:
/data/data/com.termux/files/usr/share/racket/collects/racket/contract/private/arrow-val-first.rkt:555:3
/data/data/com.termux/files/usr/share/racket/collects/net/http-client.rkt:67:0: http-conn-open!
/data/data/com.termux/files/usr/share/racket/collects/net/http-client.rkt:274:0
/data/data/com.termux/files/usr/share/racket/collects/racket/contract/private/arrow-val-first.rkt:555:3
/data/data/com.termux/files/usr/share/racket/collects/net/url.rkt:201:0: http://getpost-impure-port
/data/data/com.termux/files/usr/share/racket/collects/net/url.rkt:309:2: redirection-loop
/data/data/com.termux/files/usr/share/racket/collects/racket/contract/private/arrow-val-first.rkt:555:3
/data/data/com.termux/files/usr/share/racket/collects/pkg/private/network.rkt:59:3
/data/data/com.termux/files/usr/share/racket/collects/pkg/private/network.rkt:33:4
/data/data/com.termux/files/usr/share/racket/collects/racket/private/more-scheme.rkt:206:2: call-handled-body
/data/data/com.termux/files/usr/share/racket/collects/pkg/private/catalog.rkt:138:9: for-loop
/data/data/com.termux/files/usr/share/racket/collects/pkg/private/catalog.rkt:135:2: lookup-normally
/data/data/com.termux/files/usr/share/racket/collects/pkg/private/prefetch.rkt:129:4
/data/data/com.termux/files/usr/share/racket/collects/racket/private/more-scheme.rkt:206:2: call-handled-body
/data/data/com.termux/files/usr/share/racket/collects/pkg/private/prefetch.rkt:128:2
/data/data/com.termux/files/usr/share/racket/collects/pkg/private/prefetch.rkt:172:7
```
---
### Author:  [@Zeb](https://racket.discourse.group/u/Zeb)
#### Post date: [November 7, 2024, 3:46am UTC](https://racket.discourse.group/t/tcp-connect-failing-since-upgrade-to-8-15-on-termux/3298/2 "2024-11-07T03:46:43Z")
Wondering if it's related to this recent change which I see mentioned here: [Release Announcement for v8.15 - #21 by shhyou](https://racket.discourse.group/t/release-announcement-for-v8-15/3278/21)
---
### Author:  [@Zeb](https://racket.discourse.group/u/Zeb)
#### Post date: [November 7, 2024, 7:39pm UTC](https://racket.discourse.group/t/tcp-connect-failing-since-upgrade-to-8-15-on-termux/3298/3 "2024-11-07T19:39:18Z")
I didn't get this bug when migrating on a different machine in my network. So I don't think it's network conditions. That was a Linux desktop
---
### Author:  [@Zeb](https://racket.discourse.group/u/Zeb)
#### Post date: [November 8, 2024, 4:28pm UTC](https://racket.discourse.group/t/tcp-connect-failing-since-upgrade-to-8-15-on-termux/3298/4 "2024-11-08T16:28:32Z")
Tcp connect is failing on my machine. Here's some output when trying to set up a basic connection.
```scheme
> (tcp-connect "google.com" 443)
tcp-connect: connection failed;
host not found
address: google.com
port number: 443
system error: Invalid value for ai_flags; gai_err=3
context...:
instantiate
eval-one-top
> (tcp-connect "google.com" 80)
tcp-connect: connection failed;
host not found
address: google.com
port number: 80
system error: Invalid value for ai_flags; gai_err=3
context...:
instantiate
eval-one-top
```
---
### Author:  [@mflatt](https://racket.discourse.group/u/mflatt)
#### Post date: [November 8, 2024, 4:49pm UTC](https://racket.discourse.group/t/tcp-connect-failing-since-upgrade-to-8-15-on-termux/3298/5 "2024-11-08T16:49:13Z")
It does look like [rktio: use `AI_V4MAPPED` and `AI_ADDRCONFIG` · racket/racket@3acb5b3 · GitHub](https://github.com/racket/racket/commit/3acb5b3c6712c67ad8f998f65413f5b555645fa7) is causing trouble for Android. Are you building Racket from source, so that you could try removing those lines?
---
### Author:  [@Zeb](https://racket.discourse.group/u/Zeb)
#### Post date: [November 8, 2024, 5:02pm UTC](https://racket.discourse.group/t/tcp-connect-failing-since-upgrade-to-8-15-on-termux/3298/6 "2024-11-08T17:02:40Z")
No, I'm not. And it's not something I'm likely to do either. Termux distributes bc which I don't think my device is powerful enough to build, and for some reason cs has a very long startup time on my device. Like 15s.
---
### Author:  [@mflatt](https://racket.discourse.group/u/mflatt)
#### Post date: [November 8, 2024, 5:32pm UTC](https://racket.discourse.group/t/tcp-connect-failing-since-upgrade-to-8-15-on-termux/3298/7 "2024-11-08T17:32:06Z")
It looks like non-support for `AI_V4MAPPED` on Android is a common problem, and I've pushed a repair (hopefully) as [rktio: avoid `AI_V4MAPPED` on Android · racket/racket@78fbcab · GitHub](https://github.com/racket/racket/commit/78fbcab276ffdfd8525a00e320dff81ffcbae4ce). Maybe someone responsible for the Racket package on Termux could try that patch.