Directory Service Nullpointer exception in FT Management

We've a fault tolerant Management framework set up with Primary and backup Directory Service storage (DS). Most of the time fail-overs work in switching the roles of backup and primary directory service with graceful shutdowns.

However, when there is network failures, replication connections were dropped, the DS is hanging and locked up with Nullpoint exception.

At this point, both Primary and Backup are disfunctional and can not recover. The only option to restore is to kill the process and restart which gonna be issue.

Any fix for this.

We're on latest patch:

        Sonic Management
        Release 7.6.2 Build Number 196
        Copyright (c) 1999-2008 Progress Software Corporation.
        All rights reserved.

  SonicMQ Continuous Availability Edition [Serial Number 4009181]
        Release 7.6.2 Build Number 209 Protocol P30
        Copyright (c) 1999-2008 Progress Software Corporation.

---------------

------LOG--

[10/04/15 00:43:53] ID=DIRECTORY SERVICE (warning) Replication connection SSL://edc-prod-dm:22506 failed to connect: No route to host
[10/04/15 00:44:14] ID=DIRECTORY SERVICE (severe) Directory Service failure, trace follows...
java.lang.NullPointerException
        at com.sonicsw.mtstorage.impl.Storage.doGet(Storage.java:231)
        at com.sonicsw.mtstorage.impl.Storage.get(Storage.java:160)

...

        at com.sonicsw.mf.framework.util.StateManager.requestStateChange(StateManager.java:106)
        at com.sonicsw.mf.framework.directory.DSComponent$DSStateHandler.activateNewState(DSComponent.java:4559)
        at com.sonicsw.mf.framework.directory.DSComponent$DSStateHandler.access$5900(DSComponent.java:4466)
        at com.sonicsw.mf.framework.directory.DSComponent$8.run(DSComponent.java:4493)

[10/04/15 00:44:14] ID=DIRECTORY SERVICE (severe) The transition failed...
com.sonicsw.mf.common.runtime.NonRecoverableStateChangeException: Directory Service startup failure

...

[10/04/15 00:44:14] ID=DIRECTORY SERVICE (severe) Aborting container
[10/04/15 00:44:14] (warning) Shutdown initiated (exit code=4)

...

[10/04/15 00:44:26] (warning) Failed to unload ID=DIRECTORY SERVICE, trace follows...
com.sonicsw.mf.common.MFRuntimeException: java.lang.NullPointerException
        at com.sonicsw.mf.framework.directory.DSComponent.createMFRuntimeException(DSComponent.java:3228)
        at com.sonicsw.mf.framework.directory.DSComponent.stopDirectoryService(DSComponent.java:1390)
        at com.sonicsw.mf.framework.directory.DSComponent.stop(DSComponent.java:1136)