three domains on local server- two are fine, third no longer works (no replies)

1 Windows 11 Home
2 WAMP Version 3.3.7 - 64bit
3 Apache 2.4.62.1
4 PHP 8.3.14
5 MySQL 9.1.0
5a MariaDB 11.5.2
6 WampServer icon - green
7 127.0.0.1 localhost
::1 localhost

127.0.0.1 abelard
::1 abelard

127.0.0.1 magnacp
::1 magnacp

127.0.0.1 sites
::1 sites

8 Localhost displays without problem
8a no error message.
9 phpMyAdmin, I can open log-in page, but
10 "Cannot log in to the MySQL server"
11 Windows Defender firewall, F-Secure antivirus
12 C:/wamp64/
13 There are three domains running on the local server.
[magnacp] (simple, no database usage)displays without problem.
[sites], list of local links, works as expected
[abelard] 'with databases and generally more complex, if not very sophisticated) displays
"This site can’t be reached
"abelard refused to connect."

Because the Wampserver version is not the most recent, I attempted to updatd it to the most recent version:
Renamed current folder to wamp64-old,
Stopped all Services
Removed service - MySQL, Apache
Ran install of downloaded wampserver3.4.0_x64.exe file as Administrator.
"Wampserver 64bit is already installed.
Installation will be cancelled."

Please would you advise me?
Thanking you in advance