Ruby环境下无法连接chromedriver 127.0.0.1的解决方法

Hey there, let's work through this chromedriver connection issue you're facing. First, let's recap your setup to make sure we're aligned:

• Chrome v65
• Chromedriver versions tested: 2.9 to 2.35
• Watir 6.10.3, selenium-webdriver 3.11.0
• Ruby 2.3

The error you're encountering is:

Selenium::WebDriver::Error::WebDriverError: unable to connect to chromedriver 127.0.0.1:9515

来自C:/Ruby23/lib/ruby/gems/2.3.0/gems/selenium-webdriver-3.11.0/lib/selenium/webdriver/common/service.rb:142:in connect_until_stable' 以及C:/Ruby23/lib/ruby/gems/2.3.0/gems/selenium-webdriver-3.11.0/lib/selenium/webdriver/common/service.rb:72:in block in start'...

Here are the most likely fixes, ordered by priority:

1. Fix Chromedriver-Chrome Version Mismatch #

This is the #1 cause of connection issues. Chrome 65 requires Chromedriver 2.37—your tested versions (2.9 to 2.35) are either too outdated or not the exact match for Chrome 65.

• Download Chromedriver 2.37 (pick the Windows version matching your system's 32/64-bit architecture)
• Replace your current chromedriver executable with this correct version.

2. Verify Chromedriver Path & Permissions #

• Ensure the chromedriver executable is in a folder included in your Windows PATH environment variable. If not, explicitly set the driver path in your code:

  require 'watir'
  Selenium::WebDriver::Chrome.driver_path = 'C:/path/to/your/chromedriver.exe'
  browser = Watir::Browser.new :chrome
  

• Avoid placing chromedriver in restricted folders like Program Files—use a user-accessible directory (e.g., C:\Ruby23\bin) to bypass permission blocks that prevent the driver from starting.

3. Add Chrome Startup Flags to Bypass Common Restrictions #

Windows environments sometimes have sandbox or memory constraints that block chromedriver. Try adding these flags to your Chrome options:

require 'watir'
options = Selenium::WebDriver::Chrome::Options.new
options.add_argument('--no-sandbox') # Bypasses OS security model
options.add_argument('--disable-dev-shm-usage') # Overcomes limited resource issues
options.add_argument('--disable-gpu') # Disables GPU acceleration (fixes some Windows setup bugs)
browser = Watir::Browser.new :chrome, options: options

4. Check for Port 9515 Conflicts #

The error points to port 9515, chromedriver's default port, which might be occupied by another process:

• Open Command Prompt and run:

  netstat -ano | findstr :9515
  

• If a process ID (PID) appears, open Task Manager, locate the PID, and end that process.
• Alternatively, force chromedriver to use a different port in your code:

  browser = Watir::Browser.new :chrome, port: 9516
  

5. Update Selenium-Webdriver (If Compatible) #

While your selenium-webdriver 3.11.0 works with Watir 6.10.3, updating to the latest compatible version might fix underlying bugs. Run this command in your terminal:

gem update selenium-webdriver

Start with step 1 first—version mismatch is the most common culprit here. Let me know if any of these steps resolve your problem!

内容的提问来源于stack exchange，提问作者Apzal Bahin