Symptoms

Unable to open Unisphere through browser.Internet Explorer 11 is not supported for Unisphere access.Mozilla is the recommended browser for Unisphere, yet it gives JAVA plug in required error while accessing Unisphere.

Cause

One of the causes of this issue is existence of Deployment Toolkit in installed JRE Run time environment package and Internet Explorer 11 is not supported for Unisphere access.

Resolution

Since IE11 is not the supported browser of Unisphere, we use the Mozilla browser. Mozilla is the most recommended browser for Unisphere indeed.Now open JAVA configure as Control Panel=> JAVA(32 bit)Verify only one JRE should be installed( 1.7u80 or 1.7u79 32-bit works the better):(Java SE Runtime Environment 7 - Downloads | Oracle Technology Network | Oracle)Then check the Security to be at Medium and Enable JAVA content in the browser must be checked:In Advanced Tab, check the Mozilla Family : This enables the JAVA contents in Mozilla browser. Open the Mozilla browser: Go to settings and open PluginsMake sure only JAVA™ Platform SE 7 U80 is at Ask to activate, if there is any Java Deployment Toolkit, then make it Never Activate(Disable) as bellow; Now re-open the Mozilla browser to access Unisphere.If you get below window then click on Activate Java and then Show All to select Allow and Remember:

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