[REQUEST] TCP "No such host is known ERROR" Keycheck

[ghost]

Is your feature request related to a problem? Please describe.
Iam currently trying to make a config that uses TCP connections with different hosts, whenever a host does not exist the config simply stalls and ends with a ban, the problem isn't with the proxy the problem is with the combo in that case so it keeps trying to retry with different IP's spamming bans.

Describe the solution you'd like
I'd like a way of storing TCP errors as a var so its possible to keycheck when getting the error
"No such host is known ERROR"

Describe alternatives you've considered
I've tried a keycheck that counts a fail when theres no response however this would also mean it counts a fail with a bad proxy.
I've also tried running a TCP connection to a predetermined host, then once the connection establishes disconnect and try the host from the wordlist. This however would mean atleast 3 more blocks making the config slower and also at the same time making it more complex adding more points of failure incase if the proxy suddenly stops working.
Additional context
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