[SOLVED] Windows 10 network speed capped at 100mbps on Gigabit port

[Iridescent_Blue]

Hi all, I've been trying to troubleshoot this issue for a couple of days now. I have a windows 10 PC that's got it's network port capped at 100mbps on a gigabit network port to my NAS.
It's only a recent issue but I don't know what caused it. I've tried updating windows, the drivers from OEM, turning off power saving for the network port, disabling my VPN (PIA), I've also confirmed that I'm using gigabit compliant network cables which i have also swapped out to see if that was the issue (All Cat-VI) and my network switch is also gigabit compliant and isn't throttling any of my connections, it appears to be the PC itself, not the rest of the network.

One thing i have tried, not sure if it's any use to you, is going to my network adapter in Device Manager > Advanced > Speed and Duplex and changing it from Auto Negotiation to > 1Gbps Full Duplex which then my network connection just kicks the bucket until i change it back. Any advice of the issue would be a huge help! I've also listed my computer's specs below along with the model of my network switch and NAS if that's of any help.

CPU: AMD 1800X
RAM: Corsair Vengeance LPX 32GB (CMK16GX4M2B3000C15)
MOBO: Asus Crosshair Hero VI
GPU: Nvidia GTX 1070

NAS: Synology DS918+ 4 Bay

Network Switch: TP-Link TL-SG1016DE 16-Port Easy Smart Switch

 

[bill001g]

When you change it to 1gbit full it many times will fail even when there is no other issue. You have turned off the negotiation hardware but the switch still has it on and the results you get are unpredictable in most cases.

There is not much involved. This is a very simple process that does not really even involve firmware, it is done with the chip checking voltages on certain pin combinations.

It is either a bad port in the pc or the switch or a bad cable. Bad ports are extremely uncommon.

It almost has to be a cable. The problem is cables are very strange when they fail they can work on some machines and not others. Some machines are more tolerant of cables that are out of spec than others.

One of the very common things lately that causes this is all the fake ethernet cable on the market. The term "CAT6" or "CAT5" does not actually mean anything so vendors are abusing this. Ethernet is actually based on standards like EIA/TIA.

Cables must be pure copper (no CCA) and have wire size 22-24 (no flat or thin cables). Copper metal is expensive so they have been doing this to cut the cost of cable but these fake cable have many issues at longer distances and tend to not last as long as cables that are certified.

 

[Iridescent_Blue]

When you change it to 1gbit full it many times will fail even when there is no other issue. You have turned off the negotiation hardware but the switch still has it on and the results you get are unpredictable in most cases.

There is not much involved. This is a very simple process that does not really even involve firmware, it is done with the chip checking voltages on certain pin combinations.

It is either a bad port in the pc or the switch or a bad cable. Bad ports are extremely uncommon.

It almost has to be a cable. The problem is cables are very strange when they fail they can work on some machines and not others. Some machines are more tolerant of cables that are out of spec than others.

One of the very common things lately that causes this is all the fake ethernet cable on the market. The term "CAT6" or "CAT5" does not actually mean anything so vendors are abusing this. Ethernet is actually based on standards like EIA/TIA.

Cables must be pure copper (no CCA) and have wire size 22-24 (no flat or thin cables). Copper metal is expensive so they have been doing this to cut the cost of cable but these fake cable have many issues at longer distances and tend to not last as long as cables that are certified.

Ah okay, gotcha, that explains why it kept dropping out then. I have tried different ports on my switch and also tried a USB 3.0 Ethernet adapter and no dice so It might end up being cheap cabling

Is there anywhere you suggest to get decent quality cabling from?

 

[bill001g]

Many local home improvement stores sell them. There likely is little differnce in the price since you have online shipping even for 1 cable. Buying locally you can look at the cables before you buy them. Beldon is a manufacture of actual cable and a online store called monoprice is well liked but mostly it is being careful. Amazon really cracked down on the sellers who didn't disclose they were selling CCA cable rather than pure copper. They still pretend the flat cable is actually ethernet cable but many actually tell the wire size so you know it is not valid. Most cable that is valid says EIA/TIA on the side. It should also tell you the wire size, most is 23. Some have a code CU for copper. In any case it should not have EIA/TIA printed on it if it not a cable that paid to be certified.....there was some manufacture shipping directly from china that put fake certification marks on the cable.

 

[Iridescent_Blue]

ot valid. Most cable that is valid says EIA/TIA on the side. It should also tell you the wire size, most is 23. Some have a code CU for copper. In any case it should not have EIA/TIA printed on it if it not a cable that paid to be certified.....there was some manufacture shipping directly from china that put fake certification marks on the cable.

Found my spare roll of good quality cable and crimped a new connection and it worked like a charm. Thanks so much! Who would have thought TWO of my cables were actually damaged haha.