To resolve the issue, install a DDEI 5.1 hotfix, with version number later than 1394:
- Log on to DDEI web console via admin account.
- Go to Administration > Product Updates then click Hot Fixes / Patches. The Install Hot Fix / Patch screen appears.
- Click Browse and select the "ddei_51_lx_en_hfb1394.7z.tar" Hotfix file.
- Click Install. Wait until the hotfix is installed successfully and the logon page appears.
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Verify that the Hotfix has been installed successfully:
- Go to Administration > Product Updates then click Hot Fixes / Patches. In the History table, check if the Build is "1394" and Description is "Hotfix 1394".
- Under Help, Choose the About.
- Verify that the Hotfix number is "1394".
- Verify that the Hardware model is “Deep Discovery Email Inspector 7300 V1”.
- Clear the web browser cache.