CODEWITHSUNDEEP
ruby-on-railsrestherokuport
echan00
echan00

Reputation: 2807

SocketError (Failed to open TCP connection to XXX.com:443 (getaddrinfo: Temporary failure in name resolution))

I recently integrated Tencent's translation API. Everything works fine on my development machine, but I am having trouble making a POST request from my Heroku server. 

SocketError (Failed to open TCP connection to tmt.tencentcloudapi.com:443 (getaddrinfo: Temporary failure in name resolution))

The question I have is who's problem is causing this issue? Heroku or Tencent?

UPDATING POST w/ code:

  host = "tmt.tencentcloudapi.com"
  endpoint = "https://" + host
  uri = URI.parse(endpoint)

  http = Net::HTTP.new(uri.host, uri.port)
  http.use_ssl = true
  req = Net::HTTP::Post.new(endpoint, {'Content-Type' => 'application/json; charset=utf-8', 'Authorization' => authorization, 'Host' => host, 'X-TC-Action' => action, 'X-TC-Version' => version, 'X-TC-Timestamp' => timestamp.to_s, 'X-TC-Region' => region })

  req.body = params        
  res = http.request(req)

Upvotes: 4

Views: 11431

Answers (2)

echan00
echan00

Reputation: 2807

As per Tencent's API documentation https://cloud.tencent.com/document/api/551/15614

I use tmt.na-siliconvalley.tencentcloudapi.com instead of tmt.tencentcloudapi.com

Upvotes: 0

Peter Gao
Peter Gao

Reputation: 96

Your question asks "who's problem is causing this issue?" and propose two culprits--let me propose a third (and likely) culprit: The Great Firewall of China.

Heroku runs on AWS, which is sometimes by the Chinese government. Heroku itself may also be subject to blockage by the Chinese government, depending on the time of day, month, year, and if any sensitive internal political activity is happening. This is all very hard to predict.

I did come across this blog post, which claims that Heroku is blocked in China: https://alexbosworth.net/post/13244162414/should-i-use-heroku

Heroku Apps are blocked in China - I live in China, I want a service that isn’t blocked here. China is projected to become the biggest economy in the world within 5 years, it’s an important market.

Given how DNS resolutions work (and be default, is unencrypted), the Great Firewall performs DPI (deep packet inspection) on any incoming and outgoing packets. When it sees a return IP address that is in the blocked range (e.g. Heroku's IP block), then the Great Firewall will block any packets from exiting China and reaching your US-based Heroku instance.

This would explain why, if all authoritative servers for Tencent is in China, and Heroku is blocked, then your DNS resolution can fail.

Upvotes: 2

Related Questions