Selenium error: No response from server for url http://localhost:7055

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I’m using Selenium, C#, NUnit to write tests, sometimes I getting below error:-

OpenQA.Selenium.WebDriverException : No response from server for url
htt?://l?calhost:7055/hub/session/8dd13f5c-7ca6-4aa6-babc-f0ff6d940f0a/element

Here is stack trace:

OpenQA.Selenium.WebDriverException : No response from server for url
htt?://localhost:7055/hub/session/8dd13f5c-7ca6-4aa6-babc-f0ff6d940f0a/element
at
OpenQA.Selenium.Remote.HttpCommandExecutor.CreateResponse(WebRequest
request) in
c:\Projects\WebDriver\trunk\dotnet\src\WebDriver\Remote\HttpCommandExecutor.cs:line
115 at OpenQA.Selenium.Remote.HttpCommandExecutor.Execute(Command
commandToExecute) in
c:\Projects\WebDriver\trunk\dotnet\src\WebDriver\Remote\HttpCommandExecutor.cs:line
96 at
OpenQA.Selenium.Firefox.Internal.ExtensionConnection.Execute(Command
commandToExecute) in
c:\Projects\WebDriver\trunk\dotnet\src\WebDriver\Firefox\Internal\ExtensionConnection.cs:line
128 at OpenQA.Selenium.Remote.RemoteWebDriver.Execute(String
driverCommandToExecute, Dictionary`2 parameters) in
c:\Projects\WebDriver\trunk\dotnet\src\WebDriver\Remote\RemoteWebDriver.cs:line
795 at OpenQA.Selenium.Remote.RemoteWebDriver.FindElement(String
mechanism, String value) in
c:\Projects\WebDriver\trunk\dotnet\src\WebDriver\Remote\RemoteWebDriver.cs:line
836 at OpenQA.Selenium.Remote.RemoteWebDriver.FindElementById(String
id) in
c:\Projects\WebDriver\trunk\dotnet\src\WebDriver\Remote\RemoteWebDriver.cs:line
431 at OpenQA.Selenium.By.<>c__DisplayClass2.b__0(ISearchContext
context) in
c:\Projects\WebDriver\trunk\dotnet\src\WebDriver\By.cs:line 102 at
OpenQA.Selenium.By.FindElement(ISearchContext context) in
c:\Projects\WebDriver\trunk\dotnet\src\WebDriver\By.cs:line 272 at
OpenQA.Selenium.Remote.RemoteWebDriver.FindElement(By by) in
c:\Projects\WebDriver\trunk\dotnet\src\WebDriver\Remote\RemoteWebDriver.cs:line
289 at

.####.##.#####.#########.#####.ShareServicesTest.CreateShareWidget()

Code where this error appears:

Driver.SwitchTo().Frame(frameElement);    
var wait = new WebDriverWait(parentContextable.Context.Driver, Timeout);
IWebElement element = wait.Until(d => Driver.FindElement(By.TagName(Tags.Body))); // error in this line

I figured out that this error can be thrown only in this lines of Selenium implementation code:

private static Response CreateResponse(WebRequest request)
{
Response commandResponse = new Response();
HttpWebResponse webResponse = null;
try
{
webResponse
= (HttpWebResponse)request.GetResponse();
}
catch (WebException ex)
{
webResponse
= (HttpWebResponse)ex.Response;
}
if (webResponse == null)
{
throw new WebDriverException("No response from server for url " + request.RequestUri.AbsoluteUri);
}
else
{ ...

Maybe someone knows why request.GetResponse() returns null, or if it fails why ex.Response also null?

(09.09.2012) Sorry but maybe I didn’t provide all information. I’m using FireFox driver, Win7, Selenium 2.25.1. My test fails only sometimes. Test in debug mode fails less often then in Release.

Here I found possible reasons why this happen. And if I write such code:

Driver.SwitchTo().Frame(frameElement);    
var wait = new WebDriverWait(parentContextable.Context.Driver, Timeout);
Tread.Sleep(250);
IWebElement element = wait.Until(d => Driver.FindElement(By.TagName(Tags.Body)));

Test runs OK. But Thread.Sleep is bad solution. Maybe somebody could find another, little bit better solution.

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