I have a cable running through my walls directly connected to my modem, and going to a wall socket. When i run a speedtest on my computer by directly connecting to the wall socket, i get around 90 Mbit/s. However, if i run a cable directly from my modem to my computer, i get 270 Mbit/s.

This must mean there is a problem with the cable going through the wall. When I inspect the cable i see that it's CAT5e, and the wires seem to be connected correctly (from what i googled) Here are some pictures of the connections:

What might be the problem? I hope it has something to do with the connections as I don't think its even possible to replace the cable since it doesnt budge when i pull it on either side.

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3 Answers

The cable looks machine-made, so that would be the least likely suspect, especially as the socket wiring looks a disaster (sorry, but true;)

You could get a cable tester & check it out, but it looks like the socket wiring just wasn't punched down properly.
So you could save your money on a cable tester & just buy a proper punch-down tool instead. [metal with spring-loaded punch & cut mechanism, about $£€ 20] Plastic punch-down tools aren't worth the money & trying to punch-down with a screwdriver etc will just damage the socket without stripping the wire properly.
Proper tool for a proper job. Anything else is false economy.

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Maybe try to rewire?

Sometimes it looks wired correctly but it still gives issues (had it before with an 1gbit cable defaulting to 100mbit and after a rewire it was fixed)

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When i run a speedtest on my computer by directly connecting to the wall socket, i get around 90 Mbit/s. However, if i run a cable directly from my modem to my computer, i get 270 Mbit/s. .....
don't think its even possible to replace the cable since it doesnt budge when i pull it on either side.

It is possibly an issue with the cable itself.

You need to get a network technician to assess the situation and:

(a) remake cable connections that test bad with the technician's test equipment. Some of the connections look suspect.

(b) test the cable and suggest how to replace the cable.

I assume you do not own cable test gear, so it is better to purchase this skill in the form of a technician.

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