`socket.timeout: timed out` when using full IPv6 stack.

Environment details

• OS: macOS 10.14.5 (18F132) Mojave
• Python version: 3.7.3
• pip version: 19.1.1
• google-api-python-client version: 1.7.9

Steps to reproduce

Pre-steps:

• Have a full IPv6 stack with an IPv6 address. In my case, I have the following from Spectrum, through a Linksys WRT3200ACM router.

inet6 fe80::4ab:197d:b439:8d97%en0 prefixlen 64 secured scopeid 0x9 
inet6 2604:6000:1013:a0eb:cca:87bb:d7ed:91b6 prefixlen 64 autoconf secured 
inet6 2604:6000:1013:a0eb:91e1:1128:7728:8e1 prefixlen 64 autoconf temporary 

Error:

1. Follow the steps for the Python Quickstart (https://developers.google.com/docs/api/quickstart/python)
2. run python quickstart.py
3. python exits with socket.timeout: timed out error

If I open System Preferences > Network > Wi-FI > Advanced > TCP/IP and change the IPv6 configuration from Automatically to Link-local only, the quickstart.py properly runs.

[gselva]

@vladignatyev - I had this error and was able to get around it by updating /etc/gai.conf to prefer IPV4 over IPV6 (uncomment the line precedence ::ffff:0:0/96 100 ).

[clmcavaney]

Had the same issue. I can see from a nmap that TCP ports 80 and 443 are not open on the IPv6 addresses for www.googleapis.com but they are open for IPv4 addresses:

$ nmap -Pn -p80,443 -6 www.googleapis.com

Starting Nmap 7.60 ( https://nmap.org ) at 2021-06-04 17:57 AEST
Nmap scan report for www.googleapis.com (2404:6800:4015:802::200a)
Host is up.
Other addresses for www.googleapis.com (not scanned): 2404:6800:4015:801::200a 2404:6800:4015:800::200a 2404:6800:4015:803::200a 142.250.70.234 142.250.70.170 142.250.70.138 142.250.70.202
rDNS record for 2404:6800:4015:802::200a: mel05s01-in-x0a.1e100.net

PORT    STATE    SERVICE
80/tcp  filtered http
443/tcp filtered https

Nmap done: 1 IP address (1 host up) scanned in 3.07 seconds

$ nmap -4 www.googleapis.com

Starting Nmap 7.60 ( https://nmap.org ) at 2021-06-04 17:56 AEST
Nmap scan report for www.googleapis.com (142.250.70.202)
Host is up (0.034s latency).
Other addresses for www.googleapis.com (not scanned): 2404:6800:4015:802::200a 2404:6800:4015:803::200a 2404:6800:4015:800::200a 2404:6800:4015:801::200a 142.250.70.234 142.250.70.138 142.250.70.170
rDNS record for 142.250.70.202: mel05s01-in-f10.1e100.net
Not shown: 998 filtered ports
PORT    STATE SERVICE
80/tcp  open  http
443/tcp open  https

Nmap done: 1 IP address (1 host up) scanned in 5.16 seconds

I used the quick hack from here in my code to force the underlying socket to connect over IPv4: https://stackoverflow.com/a/50044152

It looks like a Google firewall issue