Download failed. Unable to verify

I tried to download JDK and it opened Sun(TM) Download Manager. The manager keeps reconnecting to the server. After a short whilte, it says in status that Download failed. Unable to verify. See help info.
My OS is Vista.
Any tip will be greatly appreciated.

Hello, I recently had the same problem. I came by this topic looking for a solution. I was trying to download JDK Update 11
Probably not a coincidence.
I fixed by problem, by disabling verification.
============================
Download Fails with Status of "Download failed. Unable to verify": SDM uses small "verification property files" (VPFs) that may be downloaded automatically by SDM to provide real-time checksum verification of files as they download. If your download fails and you see the Status message, "Download failed. Unable to verify. See Help for more info.", it is possible there is an accidental mismatch between the VPF file and the file being downloaded. You can try the download again with Verification turned off -- SDM can be used successfully without VPFs. To turn off verification:
***Select "File-->Options"
*** In the Options window, uncheck "Use automatic file verification when available (recommended)".
*** Click OK to close the Options window.
*** In the SDM main window, click the file name, then "Retry", then "Start" to try the download again without verification.
*** In general, it is much better to use verification when available. Please turn it back on after downloading the problematic file

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Download failed. Unable to verify

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