This issue is documented in bug 220955 which is a duplicate of 220955 and has been fixed in SGOS 6.5.7.7 or greater.
Workaround
There is no service impact to the DRTR/Webpulse service as there are several IP addresses that are used, if a connection cannot be made to 185.2.196.203 then the service will simply use of of the others. If you are unable to upgrade you can simply disable the healthcheck for the DRTR service, for these steps please see article
000016376.