Selenium – A exception with a null response was thrown sending an HTTP request

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本文探讨了使用TeamCity代理运行自动化测试时遇到的问题及解决尝试。错误表现为发送HTTP请求到远程WebDriver服务器时出现异常，导致测试失败。文章详细记录了排查过程，包括检查TeamCity服务状态、IE配置验证、利用Fiddler进行网络调用检查等。

[Problem]
We use teamcity agent to run automation(mstest, selenium). It always fail with below error message. But when I run automation in this agent machine loacally, it works very well.Test method EFSchools.EnglishFirst.Odin.UITest.Features.AdvancedSearch.AdvancedSearchFeature.UserCanSearchContactByAdvancedSearch threw exception:
OpenQA.Selenium.WebDriverException: A exception with a null response was thrown sending an HTTP request to the remote WebDriver server for URL Selenium A exception with a null response was thrown sending an HTTP request

Selenium A exception with a null response was thrown sending an HTTP request

http://localhost:21516/session/46ed7be5-0e83-45e7-9b91-1dd961847f06/element/d1808de8-640e-4316-8f0b-3ee2b47d7c52/value. The status of the exception was ReceiveFailure, and the message was: The underlying connection was closed: An unexpected error occurred on a receive. —> System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a receive. —> System.IO.IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. —> System.Net.Sockets.SocketException: An existing connection was forcibly closed by the remote host

[Things I tried]

1. check wether teamcity agent service is started.
2. IE configuration is correct.
– security consistant in each level
– clear history when close browser
3. User fiddler to check every call ,since we can’t view the running display via teamcity
4. IE 11 is not supported with current web driver
5. narrow down the issue wether it’s repro on other browser(e.g: chrom or firefox)