pfSense

Previous issues: #11218, #11220

Though you still did not provide enough information here, I managed to piece together enough from your rejected issues to figure out what you were talking about. In the future, you must include all details in the current issue.

With the information that the port was the problem I was able to spot a bug in the code which seems to be the culprit. The small change below should fix it for you.

index 1d84efd223..65b48e0e77 100755
--- a/src/etc/rc.carpmaster
+++ b/src/etc/rc.carpmaster
@@ -130,7 +130,7 @@ if (!empty($config['captiveportal']) && is_array($config['hasync']) && !empty($c
                $xmlrpc_username = $config['hasync']['username'];
        }
        $xmlrpc_port = $config['system']['webgui']['port'];
-       if (empty($port)) {
+       if (empty($xmlrpc_port)) {
                if ($config['system']['webgui']['protocol'] == "http") {
                        $xmlrpc_port = "80";
                } else {

It's too late to fix this for 2.5.0, but the next patch release we put out can include it.

Applied in changeset commit:fef846ce7ec4158a140f359b0fb35182f6ae9db9.

Needs picked back after the release is tagged.

Picked back

Tested in

2.5.1-RC (amd64)
built on Thu Mar 18 03:04:03 EDT 2021
FreeBSD 12.2-STABLE

It's fixed. The XMLRPC errors are no longer generated with GUI on alternative port. Marking the ticket resolved.