@olivierlambert Created a pull request on this matter, I hope it's properly described.

@stormi I will try and look into that tomorrow! Thanks guys

HOLY MOLY! I think I fixed it by disabling TCP offloading according to this article:

https://docs.aws.amazon.com/AWSEC2/latest/WindowsGuide/pvdrivers-troubleshooting.html#citrix-tcp-offloading

Internet works without ssl/tls errors! I'm going to check right away if I can get the 2.5Gbit speeds!

EDIT: As of now I get 1.70 Gbits/sec with an Iperf3 test, this is amazing! Not getting the full speed is probably because of VM overhead or the cat5E cables who aren't that shiny anymore.

I want to thank you all for taking the time to help! It must be a pain sometimes! Especially people who revive old threads. BUT I can finally follow my VirtualMachine dreams I had planned for a long time. You guys are amazing, I've been using Xcp-NG for a year and there will be many more years to come!

Merry Christmas! And I hope this thread will help a lot more xcp-ng fans!

@gskger Changing the MTU didn't help unfortunately I'm starting to think there is something else going win combination with the PV adapter drivers.

@olivierlambert I have been using the PV host adapter (PV drivers). It comes with the ManagementAgentx64.exe that can be found on the official Xcp-NG.ISO.

After un-installing and using emulation, it works fine, but around 30Mbit. When re-installing the PV drivers I get SSL errors again.

I'm trying to think what the problem could be, the PV drivers? the PV drivers who can't get along with the 2.5Gbe USB attached to the Xcp-NG server?

Isn't Xcp-NG just passing though it's connection to the VM?

Those are the questions I'm asking myself right now and I'll try digging into it on google a bit more.

Really strange that Ubuntu and in my case, Freenas works without problems.

Okay I un-installed the Management Agent on my windows VM and now i'm able to go on the internet without any problems! the downside is that the vm now uses the default "Realtek RTL8139C+ Fast Ethernet NIC" adapter which gives me 3-6 MB/s file transfer speeds..

a fresh ubuntu install works out of the box, I can connect to the internet. I made a test folder on the ubuntu VM and copied an ISO file to it (from my main windows pc) which gave me speeds of up to 239 MB/s.

Could the Management agent really be the issue here? and why do I need it for gbit speeds.

@olivierlambert I can spin up an ubuntu vm

@olivierlambert The clocks are good in the vm's.
Here is a screenshot of the errors I get when trying to connect to websites. Also, Pinging those same websites by hostname works normally using CMD.

@olivierlambert Thank you for the reply. I have once tried to install Lancache on a VM with the "eth1" nic (that's the usb nic) and I managed to just install games with full 2.5gbit speed! So you can say it works internally.

I made a 71-persistent-net.rules to manually assign the mac address of the NIC a name. I also, just to be sure, put the ifnames on 0 in the grub.cfg.

But if I remember correctly, installing ubuntu and starting up a browser to go to any webpage, I still get some kind of weird SSL error or 'connection not secure' in general.

I come to think that the NIC is working locally but can't connect to anything secure on the internet. To confirm this in a way, Remote desktop to the windows VM doesn't work either. I get an error. I am convinced this has to do with the fact that rdp wants to use secure connections?.

Overall, using my xenserver to ping kernel.org and google are working without problems. Internal SSH from powershell to any vm machine just works flawlessly too.

This is the exact reason i'm stressed out about this whole project, it does work.. but it doesn't work properly? And without it working properly, I can't implement it permanently on my xenserver.

This does give me problems since I have a plex server running and shared with some family members and they told me that the server is unreachable with the USB NIC.. I just don't know how to debug the SSL problem.

Quite old topic, but I have been struggling for MONTHS (literally) now and I'm getting stressed in daily life.

I have everything working so far to the point where it is showing in xencenter as a valid nic with 2500mbit full duplex specifications.

using this usb nic: https://www.club-3d.com/en/detail/2467/usb_3.1_gen1_type_a_to_rj45_2.5gbps/

I can ping with it, connect to it with SSH and give the NIC to my windows server VM. The only problem that is holding me back from using this USB nic is that all my windows VM's are getting SSL errors on any internet browser i'm on. Internet just doesn't work.

Besides that I can't even copy files from any VM to my normal PC anymore since it's getting stuck on 0KB/s and eventually crashes my explorer.exe.

Something is really wrong here and man... I must have had every single guide possible in front of me I'm sorry for reviving this thread but i'm getting desperate.

I hope there is someone who can help me maybe through email or this forum. I'm willing to share everything I did to get this working.