Google Login on My website is giving error when visitors try to login.

Google rule ID must be allowed in ModSecurity. The login error will be logged in apache error log that your host provider can find as the following result.

[Wed Mar 06 03:26:38.152664 2019] [:error] [pid 56116:tid 139954915079936] [client xxx.xx.xx.xxx:53282] [client xxx.xx.xx.xxx ModSecurity: Access denied with code 403 (phase 2). Matched phrase "/configuration.php" at ARGS:albumid. [file "/etc/apache2/conf.d/modsec_vendor_configs/comodo_apache/08_Global_Other.conf"] [line "57"] [id "210580"] [rev "2"] [msg "COMODO WAF: OS File Access Attempt||blog.domainname.com|F|2"] [data "Matched Data: /configuration.php found within ARGS:albumid: ../../configuration.php"] [severity "CRITICAL"] [tag "CWAF"] [tag "Other"] [hostname "blog.domainname.com"] [uri "/index.php"] [unique_id "XH7bfqDDIEUYuMZ6YnW25gAAAMg"]

Please ask your host provider to allow rule_id as showing in red number, 210580 for example.