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I have installed an HP DeskJet 4620 driver on a win 7 machine. All works perfectly for several days, and than printing is not longer possible. Instead I get the message: "Unable to communicate with printer".

This happened on every Win 7 PC I tried, and none of the HP/MS sites contain any relevant info...

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Please remove the solution from your question, and post it as an answer instead. You can then chose to accept this as your answer after 48 hours. –  pauska Oct 5 '12 at 9:39
    
I know. I couldn;t do that when I wrote the question due to a stack exchange limitation. –  Omri Spector Oct 6 '12 at 20:59
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1 Answer

up vote 2 down vote accepted

It appears that HP installation puts a unique "port" called "HP Network re-discovery". It stops working after some time (possibly after the first time the printer/pc enter sleep mode).

BUT, the standard MS TCP port works just fine.

So:

  1. Go to "Printers"
  2. Right click Printer
  3. Click "Printer properties" and then "Printer" or "Fax" (for both - do all this twice)
  4. Click "Add Port..."
  5. Select "Standard TCP Port"
  6. Fill in details
  7. Move printer to use the new port by un-checking the old one and checking the new one

Happy printing

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