Comment # 5 on bug 1226426 from Donald Curtis

I rechecked /etc/sysconfig/proxy --

 > grep -E 'PROXY_|_PROXY' /etc/sysconfig/proxy
PROXY_ENABLED="no"
HTTP_PROXY=""
HTTPS_PROXY=""
FTP_PROXY=""
GOPHER_PROXY=""
SOCKS_PROXY=""
NO_PROXY="localhost, 127.0.0.1"
 > 

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I then checked the user's ~/.profile –

 * Many, including root, had “source /etc/sysconfig/proxy” and
   export HTTP_PROXY
   export HTTPS_PROXY
   etc. etc.

Commented out everything which sourced /etc/sysconfig/proxy and exported the
proxy shell variables in the user's ~/.profile –
 * rebooted

The issue has disappeared.

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Something changed between Leap 15.5 and Leap 15.6 which affected the shell
variables related to proxy settings.

 * I had a similar issue with a Java Home Banking application which was caused
by having “Proxy - Use System Settings” enabled in the application.

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For me, the issue has been resolved.