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Unable to launch MWG due to JAVA issue (Windows 10)

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Hi all, i wanted to reach out to see if anyone else out there had a similar issue. Recently switched from a Windows 7 computer to Windows 10 and instantly ran into issues while trying to launch Mcafee Web Gateway GUI using Internet Explorer 11. I currently have JAVA 8 update 74 and also tried to update to JAVA 8 Update 131. Currently the message i receive is *java.security.AccessControlException: access denied ("java.lang.RuntimePermission" "setIO")*

Added the site to the java site exception list, added as trusted site in IE, as well as compatibility view, verified the java debug log and nothing interesting in there and also verified mcafee threat logs but didn't see anything being blocked on that part also. Any help would be great, thank you!

Thanks,

B

2 Solutions

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moekhass McAfee Employee
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Message 9 of 13

Re: Unable to launch MWG due to JAVA issue (Windows 10)

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​ and

You need to use JRE 8u112. To be safe side, I used x86 version but x64 might also work.

Here's where you can download older JRE : Oracle Java Archive | Oracle Technology Network | Oracle

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btlyric
Level 12
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Message 10 of 13

Re: Unable to launch MWG due to JAVA issue (Windows 10)

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In 1.8u131, Oracle updated the setting jdk.jar.disabledAlgorithms to include MD5.

Prior to u131, the setting looked like this:

jdk.jar.disabledAlgorithms=MD2, RSA keySize < 1024

Removing MD5 from the jar disabledAlgorithms setting should facilitate using u131 with MWG 7.5's GUI.

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12 Replies

Re: Unable to launch MWG due to JAVA issue (Windows 10)

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Hi bsan703i,

I ran into the same problem on windows 7 after updating Java to 8 update 131.

Your MWG is probably not updated and signed with a key considered too weak by this version of Java.

I downloaded Jportable, it only shows the 8u131 for download but you can edit the download link to red 121 or 111 instead of the 131.

Then either make sure you start the java applet with the portable version (I use the applet directly, not from within the browser), or have your system use the portable app as default. Portable app allows you not to have to do several uninstall and install sessions.

Hope this helps and good luck,

J

catdaddy Reliable Contributor
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Message 3 of 13

Re: Unable to launch MWG due to JAVA issue (Windows 10)

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Discussion successfully moved from ePolicy Orchestrator (ePO) to Web Gateway

For better assistance.

Cliff
McAfee Volunteer
catdaddy Reliable Contributor
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Message 4 of 13

Re: Unable to launch MWG due to JAVA issue (Windows 10)

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Discussion successfully moved from Web Gateway to ePolicy Orchestrator (ePO)

For better assistance.

Cliff
McAfee Volunteer

Re: Unable to launch MWG due to JAVA issue (Windows 10)

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Hi catdaddy,

I get the first move but ..moved to ePO?

I think ePO is not involved while "trying to launch Mcafee Web Gateway GUI using Internet Explorer 11"

Correct me if I'm wrong

BR,

J

catdaddy Reliable Contributor
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Message 6 of 13

Re: Unable to launch MWG due to JAVA issue (Windows 10)

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My apologies, I was asked to move it. I will move it back.

Cliff
McAfee Volunteer
rajjesh
Level 9
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Message 7 of 13

Re: Unable to launch MWG due to JAVA issue (Windows 10)

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Hi bsan703i,

If you have the latest Java installed, probably it should work any how. Have you checked using the java official site, whether JAVA is installed and enabled properly or not.

Verify Java Version

You should receive a pop up to run the applet as you do receive while opening MWG console.

Even though the software is installed, still you might run into issues.

If this is the case just try to uninstall and reinstall.

Hope this will help.

Regards,

WI

Re: Unable to launch MWG due to JAVA issue (Windows 10)

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Were you able to figure this out?

moekhass McAfee Employee
McAfee Employee
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Message 9 of 13

Re: Unable to launch MWG due to JAVA issue (Windows 10)

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​ and

You need to use JRE 8u112. To be safe side, I used x86 version but x64 might also work.

Here's where you can download older JRE : Oracle Java Archive | Oracle Technology Network | Oracle

View solution in original post

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btlyric
Level 12
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Message 10 of 13

Re: Unable to launch MWG due to JAVA issue (Windows 10)

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In 1.8u131, Oracle updated the setting jdk.jar.disabledAlgorithms to include MD5.

Prior to u131, the setting looked like this:

jdk.jar.disabledAlgorithms=MD2, RSA keySize < 1024

Removing MD5 from the jar disabledAlgorithms setting should facilitate using u131 with MWG 7.5's GUI.

View solution in original post

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