If your Veil core wallet has been "forked" (onto invalid blocks) it is possible after you upgrade your wallet or otherwise invalidate the bad blocks (that you might have checked on the block explorer such as explorer.veil-project.com) that other peer (wallet network connections) may have banned your IP address.
Two common ways to get your wallet to appear on a different IP address are to use a VPN or to proxy your connections through Tor browser.
Change IP address via a VPN
Your VPN can be either a free or paid VPN. You will only need it temporarily for this fix, unless you want to continually use it for privacy. Please check the instructions for your particular VPN. Examples include CyberGhost VPN and ProtonVPN.
Use a fresh IP address for each and every peer connection through Tor browser
- Install and run Tor browser. This provides a Tor proxy service on port 9150 on your own computer.
- Add to your veil.conf file (and save it):
proxy=127.0.0.1:9150 - Start (or restart) your Veil wallet
New peers should begin to connect within a minute or so.