Custom webpart issue in sharepoint 2010 site

After configuring the alternet access mapping custom web part is not displaying in the site, while clicking link for webpart throwing exception:

 The "webpart5" Webpart appears to be causing a problem. Exception has been thrown by the  target of an invocation.
Web Parts Maintenance Page: If you have permission, 开发者_开发技巧you can use this page temprarily close Web parts or remove
personal settings. For more information, contact your site administrator.

Pls help somebody how to solve this issue.

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It obviously is the problem with AAM setting. Check how are you accessing the site in web Part. Is it using SPContext ? Or you are instantiating the new SPWeb object. If you are instantiang the new object, check which zone you are referring to.

Post the web part code if possible.