cancel
Showing results for 
Search instead for 
Did you mean: 
Common problems HP Solution Center not working : Adobe Flash Player Error and Unable to scan
We would like to share some of the most frequently asked questions about HP Solution Center not working : Adobe Flash Player Error and Unable to Scan.
flashmx
New member
3 2 0 0
Message 1 of 23
8,065
Flag Post

Solved!

Failed to open a connection to the device (-21345)

HP Recommended
MacBook Pro
macOS 10.15 Catalina

Office JetPro 8710-AirPrint.  When trying to open the scanner from System Preferences, I got the error message "Failed to open a connection to the device (-21345).  I have tried Resting printing system - restart Mac and it didn't work; I have enabled IPV4 only protocol and tried to restart the printer...driver updated, firmware updated.  Nothing has worked.  I used to have access to the scanner through the Systems Preferences until today. 

1 ACCEPTED SOLUTION

Accepted Solutions
BryanCustomPure
Level 7
473 470 45 147
Message 2 of 23
Flag Post
HP Recommended

The solution is to download this package which will update drivers AND THE CERTIFICATE:
ftp.hp.com/pub/softlib/software12/HP_Quick_Start/osx/Installations/Essentials/hp-printer-essentials-...

 

Easy Admin did nothing. Easy Startup did nothing. 5.1 drivers did nothing. This worked for me!

View solution in original post

Was this reply helpful? Yes No
22 REPLIES 22
BryanCustomPure
Level 7
473 470 45 147
Message 2 of 23
Flag Post
HP Recommended

The solution is to download this package which will update drivers AND THE CERTIFICATE:
ftp.hp.com/pub/softlib/software12/HP_Quick_Start/osx/Installations/Essentials/hp-printer-essentials-...

 

Easy Admin did nothing. Easy Startup did nothing. 5.1 drivers did nothing. This worked for me!

View solution in original post

Was this reply helpful? Yes No
BryanCustomPure
Level 7
473 470 45 147
Message 3 of 23
Flag Post
HP Recommended

Sorry for the double post!

Was this reply helpful? Yes No
Mpk7
Level 1
8 7 0 1
Message 4 of 23
Flag Post
HP Recommended

Running iMac (Late 2015) OS10.15.7

 

Besides the (-21345) error when trying to scan, I get a Filter failed dialog when I try to print. Downloading the printer driver software from HP & reinstalling does not help.

 

When I tried to access the recommended page about updating the drivers & certificate, I get a Not Found reply. Is there another source for that package?

 

Thanks. 

 

 

Was this reply helpful? Yes No
BryanCustomPure
Level 7
473 470 45 147
Message 5 of 23
Flag Post
HP Recommended

It won't let me post as plain text...

ftp://ftp.hp.com/pub/softlib/software12/HP_Quick_Start/osx/Installations/Essentials/hp-printer-essen...

End of link is this:

/pub/softlib/software12/HP_Quick_Start/osx/Installations/Essentials/hp-printer-essentials-S-5_14_8_4.pkg

Was this reply helpful? Yes No
Mpk7
Level 1
8 7 0 1
Message 6 of 23
Flag Post
HP Recommended

I control-clicked the link & it downloaded. Printing now works but I still get the (-21345) error when trying to scan. Any ideas?

Was this reply helpful? Yes No
BryanCustomPure
Level 7
473 470 45 147
Message 7 of 23
Flag Post
HP Recommended

Did you uninstall and reinstall in System Preferences/Printers & Scanners?

Was this reply helpful? Yes No
Mpk7
Level 1
8 7 0 1
Message 8 of 23
Flag Post
HP Recommended

I only have the HP Utility in my Applications Folder. I do not have an HP Uninstaller.

Was this reply helpful? Yes No
BryanCustomPure
Level 7
473 470 45 147
Message 9 of 23
Flag Post
HP Recommended

You have to go to System Preferences, then Printers & Scanners. Select the device, and click the minus button below. Then click the plus button to re-add it.

Was this reply helpful? Yes No
Mpk7
Level 1
8 7 0 1
Message 10 of 23
Flag Post
HP Recommended

Thanks for the reply & advice. I did as suggested and still get the message: Failed to open a connection to the device (-21345)

 

Should I restart the iMac first or afterwards? Should I do anything with the printer itself?

Was this reply helpful? Yes No
Warning Be alert for scammers posting fake support phone numbers and/or email addresses on the community. If you think you have received a fake HP Support message, please report it to us by clicking on "Flag Post".
† The opinions expressed above are the personal opinions of the authors, not of HP. By using this site, you accept the Terms of Use and Rules of Participation