Management Console Not Loading with Java error "The following resource is signed with a weak signature algorithm MD5withRSA and is treated as unsigned"

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Article ID: 169433

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Updated On:

Products

Advanced Secure Gateway Software - ASG ProxySG Software - SGOS

Issue/Introduction

As of Java 8 Updated 131 or later on PC, Java no longer accepts Java Applets signed with MD5withRSA signature algorithm

Cause

As of Java 8 Updated 131 or later on PC, Java no longer accepts Java Applets signed with MD5withRSA signature algorithm.

Resolution

Wanting to run Java 8 Update 131 or later to run Management console. The requirement now is to have to run on these versions specified below or later that no longer are signed with MD5withRSA:

SGOS 6.5.10.1 or later 
SGOS 6.6.5.2 or later
SGOS 6.7.x or later

Since the GUI is unavailable to use for upgrade a upgrade VIA Management Center or Command Line of the proxy will be needed. To upgrade with the Command Line of the ProxySG, download the SGOS image file from support.symantec.com > Downloads > Network Protection Downloads. That file will need to be hosted on a HTTP Web server. The article for upgrading from Command Line is here: Upgrade ProxySG via command line interface

NOTE: To verify the file can be retrieved by the proxy, test downloading that image file from a web browser first.

Workaround

If you are unable to upgrade your SGOS at the moment, the other workaround is to downgrade back Java to Java 8 update 121 or earlier, which will work with the older versions of SGOS.

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