Let's unify some code, and add a common implementation of a function that checks whether we have tried all DNS servers yet, and retries the transaction if we don't. We already use this same code twice. Let's use it at some other places too now — basically all cases where we switch to a new server — with the one case of packet loss, where we too switch servers, but don#t care how many times we already tried to switch.
System and Service Manager
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