502 Bad Gateway when root domain is requested

[maxdd]

Hello,
I have two problems which i hope they are related to the same thing

1. When i hit my server via browser e.g. https://my-domain.com i always receive a 502 Bad Gateway response.
   - The destination is set as "http://192.168.1.52:80" which is where nginx is actually hosted
   - I don't have any custom location set on the path "/".
   - I have some subpath configured e.g. /syncthing or /bitwarden which can be correctly access when i do https://my-domain.com/syncthing or https://my-domain.com/bitwarden.

Is the 502 Bad Gateway suggesting a proper configuration?

2. I'm asking this because my nginx proxy log is reporting something strange, particularly

[01/Dec/2023:15:08:54 +0000] - 502 502 - GET xyz "/:80/:80/:80/:80/:80/:80/:80/:80/:80/:80/:80/:80/:80/:80/" [Client 34.231.60.151] [Length 556] [Gzip -] [Sent-to 192.168.1.52/] "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0)" "http://www.yahoo.com"
[01/Dec/2023:15:08:54 +0000] - 502 502 - GET xyz "/:80/:80/:80/:80/:80/:80/:80/:80/:80/:80/:80/:80/:80/" [Client 34.231.60.151] [Length 556] [Gzip -] [Sent-to 192.168.1.52/] "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0)" "http://www.yahoo.com"
[01/Dec/2023:15:08:54 +0000] - 502 502 - GET xyz "/:80/:80/:80/:80/:80/:80/:80/:80/:80/:80/:80/:80/" [Client 34.231.60.151] [Length 556] [Gzip -] [Sent-to 192.168.1.52/] "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0)" "http://www.yahoo.com"
[01/Dec/2023:15:08:54 +0000] - 502 502 - GET xyz "/:80/:80/:80/:80/:80/:80/:80/:80/:80/:80/:80/" [Client 34.231.60.151] [Length 556] [Gzip -] [Sent-to 192.168.1.52/] "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0)" "http://www.yahoo.com"
[01/Dec/2023:15:08:54 +0000] - 502 502 - GET xyz "/:80/:80/:80/:80/:80/:80/:80/:80/:80/:80/" [Client 34.231.60.151] [Length 556] [Gzip -] [Sent-to 192.168.1.52/] "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0)" "http://www.yahoo.com"
[01/Dec/2023:15:08:54 +0000] - 502 502 - GET xyz "/:80/:80/:80/:80/:80/:80/:80/:80/:80/" [Client 34.231.60.151] [Length 556] [Gzip -] [Sent-to 192.168.1.52/] "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0)" "http://www.yahoo.com"
[01/Dec/2023:15:08:54 +0000] - 502 502 - GET xyz "/:80/:80/:80/:80/:80/:80/:80/:80/" [Client 34.231.60.151] [Length 556] [Gzip -] [Sent-to 192.168.1.52/] "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0)" "http://www.yahoo.com"
[01/Dec/2023:15:08:54 +0000] - 502 502 - GET xyz "/:80/:80/:80/:80/:80/:80/:80/" [Client 34.231.60.151] [Length 556] [Gzip -] [Sent-to 192.168.1.52/] "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0)" "http://www.yahoo.com"
[01/Dec/2023:15:08:54 +0000] - 502 502 - GET xyz "/:80/:80/:80/:80/:80/:80/" [Client 34.231.60.151] [Length 556] [Gzip -] [Sent-to 192.168.1.52/] "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0)" "http://www.yahoo.com"
[01/Dec/2023:15:08:54 +0000] - 502 502 - GET xyz "/:80/:80/:80/:80/:80/" [Client 34.231.60.151] [Length 556] [Gzip -] [Sent-to 192.168.1.52/] "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0)" "http://www.yahoo.com"
[01/Dec/2023:15:08:54 +0000] - 502 502 - GET xyz "/:80/:80/:80/:80/" [Client 34.231.60.151] [Length 556] [Gzip -] [Sent-to 192.168.1.52/] "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0)" "http://www.yahoo.com"
[01/Dec/2023:15:08:54 +0000] - 502 502 - GET xyz "/:80/:80/:80/" [Client 34.231.60.151] [Length 556] [Gzip -] [Sent-to 192.168.1.52/] "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0)" "http://www.yahoo.com"
[01/Dec/2023:15:08:54 +0000] - 502 502 - GET xyz "/:80/:80/" [Client 34.231.60.151] [Length 556] [Gzip -] [Sent-to 192.168.1.52/] "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0)" "http://www.yahoo.com"
[01/Dec/2023:15:08:54 +0000] - 502 502 - GET xyz "/:80/" [Client 34.231.60.151] [Length 556] [Gzip -] [Sent-to 192.168.1.52/] "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0)" "http://www.yahoo.com"
[01/Dec/2023:15:08:54 +0000] - 502 502 - GET xyz "/" [Client 34.231.60.151] [Length 556] [Gzip -] [Sent-to 192.168.1.52/] "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0)" "http://www.yahoo.com"

It is as if that 502 is making some external services try different time the :80/ in the hope of having a proper response

[maxdd]

I have added the following in the "Advanced"

location / {
    proxy_pass http://192.168.1.52:80;
    proxy_ssl_server_name on;
}

which since there is nothing on port 80 of that ip i get a 404 although i would rather prefer to use the proper way e.g. serve directly a 404.html