Dear @Leonid S and @Alex T⚜️

As I've already mentioned in my post, there is nothing about this issue in the cPanel error log file. But after desperately trying to find a solution to the problem, I came across many proxy_fcgi:errors and Failed to read FastCGI header errors in the /var/log/apache2/error_log file as shown below.

/var/log/apache2/error_log

[Fri Oct 06 06:42:45.204619 2023] [proxy_fcgi:error] [pid 2195:tid xxxxxxxxxxxxxx] (70007)The timeout specified has expired: [remote xxx.xx.xx.xx:xxxxx] AH01075: Error dispatching request to : (polling), referer: https://www[dot]site[dot]com/view-persons-profile/xxxxx

[Wed Oct 11 12:05:09.841770 2023] [proxy_fcgi:error] [pid 3750:tid xxxxxxxxxxxxxx] (70007)The timeout specified has expired: [remote xxx.xx.xx.xx:xxxxx] AH01075: Error dispatching request to : (polling), referer: https://www[dot]site[dot]com/view-persons-profile

[Thu Oct 12 10:00:14.429856 2023] [proxy_fcgi:error] [pid 25266:tid xxxxxxxxxxxxxx] [remote xxx.xx.xx.xx:xxxxx] AH01067: Failed to read FastCGI header, referer: https://www[dot]site[dot]com/persons-home

[Mon Oct 16 21:09:39.470971 2023] [proxy_fcgi:error] [pid 27606:tid xxxxxxxxxxxxxx] (70007)The timeout specified has expired: [remote xxx.xx.xx.xx:xxxxx] AH01075: Error dispatching request to : (polling), referer: https://www[dot]site[dot]com/persons-home

[Tue Oct 17 00:56:11.852494 2023] [proxy_fcgi:error] [pid 27607:tid xxxxxxxxxxxxxx] [client xxx.xx.xx.xx:xxxxx] AH01071: Got error 'Primary script unknown' referer: https://www[dot]site[dot]com/

Please help!

Thanks