https://community.usa.canon.com/t5/Desktop-Inkjet-Printers/Failed-to-open-a-connection-to-the-device-21345-Unable-to-use/m-p/555382#M79856 <P>I am using my MacBook Air (2024) in macOS Sequoia 15.5 to connect my current Canon E510 scanner.</P><P>All I got is the error pop-up window that says "Failed to open a connection to the device (-21345)". I tried looking up answers in this community post, but most of the posts are older, especially from 2020.</P><P>I hope someone here can assist with this issue at this time.</P><P>Thank you.</P> Mon, 30 Jun 2025 15:29:14 GMT jyu87 2025-06-30T15:29:14Z https://community.usa.canon.com/t5/Desktop-Inkjet-Printers/Failed-to-open-a-connection-to-the-device-21345-Unable-to-use/m-p/555382#M79856 <P>I am using my MacBook Air (2024) in macOS Sequoia 15.5 to connect my current Canon E510 scanner.</P><P>All I got is the error pop-up window that says "Failed to open a connection to the device (-21345)". I tried looking up answers in this community post, but most of the posts are older, especially from 2020.</P><P>I hope someone here can assist with this issue at this time.</P><P>Thank you.</P> Mon, 30 Jun 2025 15:29:14 GMT https://community.usa.canon.com/t5/Desktop-Inkjet-Printers/Failed-to-open-a-connection-to-the-device-21345-Unable-to-use/m-p/555382#M79856 jyu87 2025-06-30T15:29:14Z https://community.usa.canon.com/t5/Desktop-Inkjet-Printers/Failed-to-open-a-connection-to-the-device-21345-Unable-to-use/m-p/555383#M79857 <DIV style="font-family: sans-serif; color: #333; line-height: 1.4;"><STRONG>Welcome to the Canon Community, and thank you for your post!</STRONG><BR /><BR />This forum is hosted and moderated by <STRONG>Canon USA</STRONG>, and we can only provide support for products that were made for and sold in the <STRONG>United States</STRONG>.<BR /><BR /><STRONG>Your product</STRONG> is not sold or supported by Canon USA.<BR /><BR />If you live outside the U.S., please&nbsp;<A style="color: #234071; text-decoration: underline;" href="https://global.canon/en/support" target="_blank" rel="noopener">click here&nbsp;</A>to find support in your country or region.<BR /><BR />You’re always welcome to talk about Canon products from anywhere in the world, but please know that Canon USA cannot offer direct support for international models.</DIV> Mon, 30 Jun 2025 15:34:07 GMT https://community.usa.canon.com/t5/Desktop-Inkjet-Printers/Failed-to-open-a-connection-to-the-device-21345-Unable-to-use/m-p/555383#M79857 Stephen 2025-06-30T15:34:07Z