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When I enable the rgw_dns_name config option, and I set for example:

client.rgw.default advanced rgw_dns_name s3.cephlabs.com

The RGW dashboard section times out:

Traceback (most recent call last):
File "/usr/share/ceph/mgr/dashboard/rest_client.py", line 398, in do_request
resp = self.send_request(method, url, request_headers, params, data)
File "/usr/share/ceph/mgr/dashboard/rest_client.py", line 444, in send_request
resp = self.session.get(
File "/lib/python3.9/site-packages/requests/sessions.py", line 557, in get
return self.request('GET', url, **kwargs)
File "/usr/share/ceph/mgr/dashboard/rest_client.py", line 47, in request
return super(TimeoutRequestsSession, self).request(*args, **kwargs)
File "/lib/python3.9/site-packages/requests/sessions.py", line 544, in request
resp = self.send(prep, **send_kwargs)
File "/lib/python3.9/site-packages/requests/sessions.py", line 657, in send
r = adapter.send(request, **kwargs)
File "/lib/python3.9/site-packages/requests/adapters.py", line 504, in send
raise ConnectTimeout(e, request=request)
requests.exceptions.ConnectTimeout: HTTPConnectionPool(host='s3.cephlabs.com', port=8000): Max retries exceeded with url: /admin/metadata/user?myself (Caused by ConnectTimeoutError(<urllib3.connection.HTTPConnection object at 0x7f99df22fe20>, 'Connection to s3.cephlabs.com timed out. (connect timeout=45)'))

It's related to the introduction of a change where rgw_dns_name if set is used as the address for the gateway:

https://github.com/ceph/ceph/blob/main/src/pybind/mgr/dashboard/services/rgw_client.py#L97

The rgw_dns_name parameter can be a list of domains to which you want the RGW to respond for virtual bucket access and does not represent the IP of an RGW; it would normally be the IP of a load balancer that may not be accessible from the Dashboard.