DPC: DPC-Reports incorrect HSTS TTL Nessus scanner

Nessus scanner and Chrome Web Developer tools show HSTS TTL as 15,780,000 s (six Months). 

Security requires this to be at least 31536000 (one Year). 

This is usually a false positive as the default setting in DPC for HSTS is 63072000 (two Years).

To check the settings, log in to the DPC using SSH/Putty as admin and su - to root, and run the following command:

• curl -k -i https://<DPCFQDN> |less

  Where <DPCFQDN> is the FQDN of the DPC server.
• You get an output like the following:

Server: nginx
Date: Wed, 22 Nov 2023 19:52:17 GMT
Content-Type: text/html; charset=UTF-8
Content-Length: 648123
Connection: keep-alive
X-DNS-Prefetch-Control: off
X-Frame-Options: SAMEORIGIN
Strict-Transport-Security: max-age=15552000; includeSubDomains
X-Download-Options: noopen
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
Accept-Ranges: bytes
Cache-Control: public, max-age=0
Last-Modified: Mon, 11 Sep 2023 12:07:27 GMT
ETag: W/"9e3bb-18a8423b418"
Cache-Control: no-cache, no-store, must-revalidate
Pragma: no-cache
Expires: 0
X-Frame-Options: SAMEORIGIN
X-Content-Type-Options: nosniff
Strict-Transport-Security: max-age=63072000; includeSubdomains;
Content-Security-Policy: frame-ancestors 'self'; object-src 'self'; default-src 'self' 'unsafe-inline' data:; script-src 'self' 'unsafe-inline';

The 'Strict-Transport-Security: max-age=63072000; includeSubdomains;' line shows that this is set to 63072000 s or 2 years.
You can also check the /etc/nginx/conf.d/default.conf file, you see the following sections showing the max-age:


Below is the output from the web Developer tools in Chrome for the same system as above: