Problem with HttpUrlConnection after migration to Windows 7 from MATLAB R2010+

Question

Deborah 2011-9-26

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https://ww2.mathworks.cn/matlabcentral/answers/16792-problem-with-httpurlconnection-after-migration-to-windows-7-from-matlab-r2010

I recently upgraded from Windows XP to Windows 7, and software I was using to read data from web sites doesn't work now. I'm using something like:

>> site_or_html_filename=java.lang.String('http://www.google.com');

>> my_url = java.net.URL(site_or_html_filename);

>> connection = my_url.openConnection();

>> connection.setConnectTimeout(0);

>> connection.setDoOutput(true);

>> in = connection.getInputStream();

??? Java exception occurred: java.net.ConnectException: Connection timed out: connect

Note that I'm calling a Java class that does the above, and the class includes a trust manager that does not validate certificate chains. This worked fine in Windows XP, but I can't get it to work in Windows 7. I've disabled the firewall, so I don't think that's the issue. I've also tried setting System properties proxySet,proxyPort and proxyHost to no avail. Can anybody help?

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Answer 1

Deborah 2011-9-30

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https://ww2.mathworks.cn/matlabcentral/answers/16792-problem-with-httpurlconnection-after-migration-to-windows-7-from-matlab-r2010#answer_23126

It turns out that what MATLAB is returning for the connection is ice.net.HttpURLConnection, which doesn't complete the connection, while sun.net.www.protocol.http.HttpURLConnection will. Adding the following fixed the Connect timeout problem:

% This version is needed on Windows 7 handler = sun.net.www.protocol.http.Handler;

my_url = java.net.URL([],site_name,handler);

% This version works on Windows XP, but won't work on Windows 7

% my_url=java.net.URL(site_name);

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Answer 2

Deborah 2011-9-26

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https://ww2.mathworks.cn/matlabcentral/answers/16792-problem-with-httpurlconnection-after-migration-to-windows-7-from-matlab-r2010#answer_22650

I forgot to mention, I already tried running matlab in Windows XP compatibility mode - that didn't help. The software also works fine when I run the Java class from cygwin. It's only when I run from MATLAB that I see this problem.

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Answer 3

Jason Ross 2011-9-26

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Are you running with UAC (User Access Control) enabled or disabled?

You could try either turning it off in the Control Panel, or running MATLAB as Administrator by right-clicking on matlab.exe and selecting "Run as Administrator".