Connecting to SAN devices no longer working as expected

Jun 21, 2019 04:54 GMT  ·  By

Microsoft has just confirmed another issue in the May 2019 cumulative updates for Windows 10, and the company says that it is already working on a fix.

Specifically, the bug, which is currently listed as acknowledged with no mitigation available, could break down the access to Storage Area Network (SAN) devices. The software giant explains the following for Windows 10 version 1809 (October 2018 Update):

“Devices may have issues connecting to some Storage Area Network (SAN) devices using Internet Small Computer System Interface (iSCSI) after installing KB4497934.”

An ETA for the patch isn’t yet available, but Microsoft says it “will provide an update as quickly as possible.” New cumulative updates are expected as part of the July Patch Tuesday, but it remains to be seen if a fix will be included or not.

Issue introduced by May updates

The problem is caused by the May 2019 Updates, and the June release does not resolve it.

Meanwhile, the versions that are affected by this bug, along with the cumulative updates causing it, are the following:  

Windows 10 version 1809: May 21, 2019—KB4497934 (OS Build OS 17763.529)
Windows 10 version 1803: May 21, 2019—KB4499183 (OS Build 17134.799)
Windows 10 version 1709: May 28, 2019—KB4499147 (OS Build 16299.1182)
Windows 10 version 1703: May 28, 2019—KB4499162 (OS Build 15063.1839)
Windows 10 version 1607: May 23, 2019—KB4499177 (OS Build 14393.2999)
Microsoft has confirmed that the issue also exists on Windows Server 2016 and Windows Server 2019.

The only way to resolve the bug is to uninstall these cumulative updates. However, this is not recommended, as the updates bring both security and non-security improvements, and removing them could leave your device vulnerable to attacks or bring back other issues that have already been addressed.