Cannot scan to network folder on MAC

[gesmike]

I was having the same issue. Updated the firmware as suggested in https://h30434.www3.hp.com/t5/Scanning-Faxing-and-Copying/MFP-M477fdn-can-t-scan-into-network-folder..., but that did not work either. Last thing I did was reset the wireless settings and connected back to our network. I then tried scanning just a blank piece of paper as a test and that went through. So I tried my two page document and it failed again. Now nothing is working, not even scan to email.

[gesmike]

Just came across this thread.

https://h30434.www3.hp.com/t5/Scanning-Faxing-and-Copying/Scan-to-Network-Folder-not-working-after-u...

Based on the info here, I changed my output resolution to 75dpi and scan to network folder worked for both color and B&W. I changed it back to 150dpi and it immediately failed again in both color and B&W. Seems there is still an issue betweem 10.13.3 and HP.

[Sommerfeld2018]

I looked at this while debugging an issue between my M277 and another SMB2 file server.

I used tcpdump to capture a packet trace between the scanner and both the mac and the other file server and then looked at this packet trace with wireshark, which can decode the SMB2 protocol. 

The mac informs the scanner during connection setup that it can accept write requests of up to 4 megabytes at a time.  (files bigger than that must be sent as multiple write requests); the other server said it could take up to a megabyte at a time.

In both cases I observed the M277 sending a malformed write request where inside the request it's asking to write about 140kb, but the write request is contained inside a NetBIOS session message that's only about 12kb long (it's exactly 128kb shorter than it should be).

If the server says it can only accept 64kb at a time, the scan works fine.   I haven't gone hunting for the actual upper limit where it works, but it's somewhere between 1MB and 64KB.

The downgrade to 75dpi probably "works" because it shrinks the file or page size to the point that the scanner doesn't misencode the write requests.

[gesmike]

@Sommerfeld2018 I'm not sure what any of that means, but I'm hoping it helps someone fix the issue. Weird thing is that I can scan from the HP Easy Scan app using color at 200 ppi with no issues. The computer and printer must be talking to each other differently using that method.

[Sommerfeld2018]

The problem is most likely specific to the scanner's implementation of the SMB file-sharing protocol, driven from the scanner side.   It could probably be fixed by a two-line change to the scanner firmware to cap the write size at 64k even if the file server will accept more than 64k at a time; the trick will be getting this information through customer support to the engineers who actually work on the firmware.

EasyScan is presumably using a different protocol, where the computer is driving, tellking the device: "please scan a page and give it to me"; "scan to folder" involves the scanner telling the computer "please store this data in a file named scan0001.pdf")

[gesmike]

Scanning at 150 dpi from the machine to computer worked just fine though prior to update to Mac OS 10.13... All my tech knowledge is basically self taught so I'd have no idea why the update would break things, but hopefully it'll get fixed soon.

[Tim42]

So this problem has been going on for months.  So the deal is:

Trying to scan to network folder.  During setup in printer, the test works fine, so that means my configuration is ok.  Please do not tell me to do that again.

Please do not tell me to change anything on my MAC that relates to this printer.  There is a network share out there which should work even if NO HP PRINTER is on that machine.

When I try to do a "scan to network share" from my HP Printer, and the resolution is set to 150 dpi or higher I get this message:

Cannot write to:

\\192.168.0.21\scans.

Destination folder is read only,

has the wrong permissions,

or is no longer available.

PLEASE NOTE:  That message cannot be true, since when I scan at 75dpi it works fine.

I would really like to scan in 150dpi or 300dpi but I get that message.

Thank you

[proxx]

HI,

I have now fix firmware [edit] 

Regards

[chazbarx]

Hi Tim,

Did you happen to get this sorted out? I was able to get scanning to network folder to work at 75 dpi, but anything else gives me the same error you had.

Appreciate the help,

Chaz

[Tim42]

No, have not figured it out.  I gave up.  After MAC updates and an HP printer update nothing has changed.  I am very disappointed.  So I now just use my flash drive to go back and forth.