I just wasted about 2 hours of my time trying to figure out why a server would only connect at 100Mbit instead of the expected 1Gbit.
I had all sorts of ideas, NIC, driver, driver settings, switch related ... and in the end, I almost don't dare to say it, it turned out to be a cabling problem ... you know, there's a tiny little difference between a Cat5 and a Cat5e cable ...
Who the heck still has Cat5 patch cables lying around?!! ... me, for example 😱 but one less now!!
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