This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

FF not connecting to web- This "Network Connections" message pops up: Error 623: The system could not find the phone book entry for this connection. Any ideas?

  • 1 reply
  • 4 have this problem
  • 2 views
  • Last reply by cor-el

more options

About a month ago I could no longer connect to the internet on our PC. Every time I clicked on the Firefox icon the Netscape sign-on window would pop up. I would try to close it but it would pop up over and over again. If I tried to close it a dozen or so times eventually Firefox would open up but it would never connect. Just today I moved my Netscape file to the recycle bin. No longer does the Netscape sign-on window pop up but following Network Connection error message pops up: "Error 623: The system could not find the phone book entry for this connection".. This error window behaves the same way the Netscape sign-on window used to behave. Every time I click to close it it pops open again. After numerous clicks Firefox opens up but it never connects.

About a month ago I could no longer connect to the internet on our PC. Every time I clicked on the Firefox icon the Netscape sign-on window would pop up. I would try to close it but it would pop up over and over again. If I tried to close it a dozen or so times eventually Firefox would open up but it would never connect. Just today I moved my Netscape file to the recycle bin. No longer does the Netscape sign-on window pop up but following Network Connection error message pops up: "Error 623: The system could not find the phone book entry for this connection".. This error window behaves the same way the Netscape sign-on window used to behave. Every time I click to close it it pops open again. After numerous clicks Firefox opens up but it never connects.

Modified by jimmythaiss1

All Replies (1)

more options

Do you have this error message on a Mac computer or on a Windows computer?

I've only seen this error mentioned on a Windows computer.