Port Translation very slow

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Port Translation very slow

L4 Transporter



We setup a inbound NAT to direct port 443 to a server on-site on 10.x.x.x and it all worked fine and fast - then it turned out we needed to adjust it to port 4443 as the customer was using port 443 for inbound client VPN connections of course.
Anyway, after I adjusted the NAT inbound for this one rule (a simple change of 443 to 4443) - the whole access method slowed down using port 4443 to the point where it is unusable / not responding.
We thought this might be because port 4443, so I tested with 2100 - same result - but the same rule with 443 redirected is fine and fast - 
Can someone please advise why this is going so slow when not using the port 443 as the standard inbound NAT to this web server?

Cyber Elite
Cyber Elite

from a NAT perspective, this should not matter

have you been able to run packetcapturesin front and behind the firewall to see where delays are introduced?

Tom Piens
PANgurus - SASE and Strata specialist; (co)managed services, VAR and consultancy
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