[SOLVED] New Cat6-cable to WAN fixed it. My old cable seems to be defective - (Took long time to get internet-access on LAN/WIFI after cold restart)

[jaclaz]

@Sirius

I do know that it works now and I have learned something valuable. Don´t assume that cables are ok, even if they have been "fine" before and seemed to work with previous equipment. It´s also an easy action to change to a new cable in troubleshooting - I should have done that earlier, after seeing the negotiation-problems in the logs.

JFYI, Pournelle's Law:

hEX S (2025) doesn't negotiate 1Gb/s with at least some 1Gb/s Ethernet adapters

Only for the record, in the (good?) ol'times, when Byte (the magazine) was a thing, Jerry Pournelle in his " Computing at Chaos Manor" column had a saying about the (at the time very advanced) SCSI bus devices to the effect of "When you have a connection problem, you should troubleshoot this, and that, and also that other thing, but it is always the cable". Which evolved into Pournelle's Law: https://www.computerworld.com/article/1332766/more-eternal-verities.html • Pournelle’s Law: Cables …

I would say that with defective ethernet cables 1% is "bad cable" and 99% is "bad RJ45 plug", usually re-terminating a cable makes it work as new.

Still JFYI, most Mikrotik devices have a built-in feature for cable testing, but- for the reasons above - if the issue is in the connector (and it is in the connector) it isn't particularly useful, but it will usually tell you about an actually shorted or interrupted cable.