Serial Port Not Working

[Stephani Kapnick]

santiagazo it sounds like you have our UD-ULTCDL which is a different model than what the original poster has. I recommend to start a separate thread about your issue or to contact us directly at sup...@plugable.com for further assistance.

Reattach the power cable to the dock first. Once the dock is powered on, reconnect it to your system which will trigger the final portion of the installation. If the device is not detected, please reboot the system.

Have had 2 laptops hard-wired to cable modem CM1100, working for last 5 months. Yesterday, one laptop could not access internet. Powered down modem, and whichever laptop is started 1st can access internet, but not the 2nd laptop. I am not changing wires or ports... whichever laptop starts first has access. Have reset modem to no avail. Anyone seen this problem? Possible solution? Thanks!

The CM modem is a modem only. Most ISPs only give out 1 WAN IP address her house hold. You would have to ask the ISP for additional WAN IPs, if they support that on 1 modem that the CM modem can support.

Hey FURRYe38 --- thanks for your quick reply. But it has worked for the last 5 months. Also note that I am not using wifi --- hardwired only. Seems like something changed with the modem. Or was I just lucky for the first 5 months?

Try this, power OFF The modem for 30 seconds then back ON with Just 1 PC connected. After the modem is ready, check internet services.

Then power OFF the modem for 30 seconds, connect the 2nd PC to the modem, Port #2. Power ON the modem. After the modem is ready, check internet services. You may or may not get internet here.

If you only get 1 port to work, you'll need to connect up a router to the back of the modem, then connect your devices to this router so you can have more than 1 devices working for internet services. This is the norm for most configurations.

Ive been using and loving my Hp spectre x360 13 for a week now. On the second day of use and today something weird happend. When plugging in my Laptop in the right hand usb c port it didnt charge, nothing happend. The charger worked for my phone (Nexus 6P) and I was able to charge the Laptop via the other port. After about half an hour both ports were usable again. What could the cause be?

I plugged my OnePlus 5 phone with a USB C to USB C cabel into the only usb c port of my laptop to transfer a lot of files, I left it there over night because 40GB took quite long and I wanted to charge it up. It was fully charged at the morning and now, a few hours later I wanted to connect my external drive but it isn't working. not a single usb c device is working, ionly normal USB 3.0 works

Now, i dont think is fully dead. SOMETIMES, on device manager, i can see USB 3.1 eXtensible Host Controller 1.10 (Microsoft) show up after a small noise, but nothing ever happens after the fact. Disabling and enabling that doesnt make a difference.

I wanted to really try troubleshoot it before taking it to microcenter for warranty service. I really want to avoid it as long as possible before i HAVE TOO, specially if its something i can fix myself.

Thank you all ahead of time.

Microcenter will fix as needed since i got their 2 yr warranty, but they are backlogged, so it will leave me like 2 weeks without my device. Which i use for my business. Other than this port, the rest of the PC works great.

Wow! I just got my Spectre back from HP Support where they replaced the motherboard because the USB-C ports weren't working. Before that, I spent hours on the web chat with them trying to resolve the problem, and no one suggested this reset procedure. But it gets more interesting. When I first got my machine back with the new motherboard, the USB-C ports were working. But then one stopped. And soon thereafter, the other one stopped. I was just getting ready to call support back when a Google search brought me to this thread. And the procedure described by CVermin54 worked! Both ports are working again!

It makes me wonder not only why the HP Support agent who helped first me the first time didn't know about or was able to find the KB Link, but whether the motherboard replacement was really necessary.

I have only had it for 4 days and need to plug in an extender because it has no range compared to old one. This is second one I have tried. No luck if anyone has a solution it would be greatly appreciated

Check the Nighthawk MR1100 and Extender IP address range. If both use 192.168.1.1 then that's the problem. Change one of them to use a different LAN network. Example, change the Extender to use 192.168.2.1 then connect to the Hotspot.

Same thing here. Can't connect to the app or directly to Ethernet to computer. No signal going out. No way to make any changes everyone is recommending because it does not exist, basically. But my ATT iscshowing 3 bars on 4G and 0 devices connected. LOL.

I have a netgear mr1100 plugged into the wall for power and with the ethernet plugged into the router. working just fine. when i remove the battery the ethernet loss concretion to the router. Do I need to take it back?

I'm running into a small problem at the end of the Getting Started guide for vagrant. I'm working on a CentOS basebox that has Apache2 running (provisioning via Puppet). I've set up port forwarding for web requests using the following line in Vagrantfile:

I wanted to add an additional note that often this is caused by the server within the VM because it binds to 127.0.0.1, which is loopback. You'll want to make sure that the server is bound to 0.0.0.0 so that all interfaces can access it.

I'd check that there are no firewalls set up restricting access to port 80. The default Vagrant VM (Ubuntu) doesn't come with a firewall set up, but you said you're using something else, so it might be worth it to check.

If that's not it, try making something other than Apache listed on port 80. Python ships with a simple HTTP server you can use -- go to the folder with index.html and run sudo python -m SimpleHTTPServer 80, then try hitting that with curl from both boxes. If that works, then it's probably an Apache configuration issue. I don't have enough experience with Apache to help if that's the case (I use nginx).

When I updated to Ubuntu 22.04 I started getting ACPI errors and my HDMI port no longer was working on my newer Samsung laptop. The following hid the ACPI errors and curiously fixed my HDMI output.This was found on linux.org related only to ACPI errors but it worked for the HDMI issue too. I cannot explain why it worked but the errors occurred the same time my HDMI port stopped working.

A couple of months ago I woke up to no internet. Did the troubleshooting only to find out Ethernet Port 1 stopped working. Just recently I have disconnected my Xe75 and I am using just three x55 much better experience in terms of stability.

At the beginning I thought it was my 6 years old storage network, or my 4 years old security cameras or my 8 years old laptop or the super cheap TP-link unattended switch but no... it is the Ethernet port. There has been several power outages at home but till now not a single device has been damage. Also, even after a factory reset, that Ethernet port still doesn't works.

Overall stability and performance remains good but still, such a disappointment that a quite new Deco unit (bought April 1st, 2023) is already malfunctioning with no easy way to diagnose more than plain trial and error (discard cables... discard devices...). Deco App not resourceful at all

@AGMV I am also facing the same issue. I checked in modem that the Deco is not sending out any packets/traffic from port 1. This looks like a wide spread issue. BTW I had a power backup to the device and it never went down. So it is not because of power fluctuations.

@abhidev I truly believe is not a power-related issue. Even with the many power outages at home, so far not a single device has been damage and it is extremely unlikely that only one port of one deco is the only casualty of those power failures. Not even the connected devices to that ethernet port during those power outages faced issues.

Windows network diagnose did provide additional info on this. The port "is there" but was unable to assign a valid IP (Error: Ethernet doesn't have a valid IP configuration). Windows recommendation: reset Ethernet, which is something I cannot do via Deco app. Even a factory reset didn't work.

Another thing that I notice was when I was trying to access my network HDD (connected to the faulty Deco Ethernet port 1) via the HDD app at my notebook. The HDD app found the network HDD but was unable to access it. The HDD app highlighted that the assigned IP to that HDD was 169.254.X.X which is a link-local addrees meaning the Deco DCHP was not reachable via that Ethernet port

I also have an XE75 V1 on firmware 1.2.7 but I have a slightly different scenario. All my Decos are hardwired in a daisy chain for backhaul and all the ports work but for whatever reason my Tado internet bridge refuses to work in port 2 of my main Deco. It works in port 1 and 3 and other ethernet devices work in port 2 but the Deco refuses to provide the Tado unit with internet on that port and it doesn't even show up in the device list. No weather related issues, just had to disconnect the system to install a shelf and plugged everything back in!

@Ukguy115 , sadly no solution from my side... tried everything and even e-mail/contact TP-Link support team. After a quick chat with them their diagnose was "faulty hardware", no further explanation. They suggest to sent back the unit to TP-Link as factory warranty is still valid. As I live outside US that is a no go for me

I spent an entire day with Samsung Support without success and they advised to contact the approved local repair center. I decided against it as I had had a rather negative experience when said repair center fried my laptop while performing a simple repair and then attempted to charge me to replace the motherboard (they had fried). Besides, I was sure it was a software Windows 11 issue so there was no point trying to go to a business that makes a profit replacing parts.

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