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I know this is an older post, but it was the first result when googling the error. Hope this helps. We have 7 HIKVision DS-2CD2132F cameras connected to a real PoE switch (no splitters). We use a HIKVision DS-7608NI as the DVR. In iVMS-4200, we could view 1 or 4 cameras at a time in Main View, but when we try to view more that that, we get the "reconnecting. error code hcnetsdk.dll [91]" error. Here's the fix: In iVMS click "Tools" Select "System Configuration" Select "Image" 'Uncheck' the "Auto-change Stream Type" option Click "Save" Close the System Configuration window and then click on "9-Screen" (or 16-Screen, or whatever you have) to reconnect to the cameras. You should now be able to see all the cameras.