Share this article
Improve this guide
Port 443 Error Code: How to Fix it
Make sure the firewall is not blocking the port
4 min. read
Published onJanuary 30, 2024
published onJanuary 30, 2024
Share this article
Improve this guide
Read our disclosure page to find out how can you help Windows Report sustain the editorial teamRead more
You may often seeThe server is not reachable on Port 443orCould not open a connection to host on port 443: Connect failedmessages. All these error codes are related toPort 443being closed or used by another process/application.
You could encounter this while accessing websites that usePort 443, configuring SCCM, or even when trying to set up a web server with Firewalla.
To start with, restart the PC and make sure the revocation list server is not offline. Also, if you are facing an issue with Nextcloud AIO container installation, try to install it inNormal Mode.
How can I fix the Port 443 error code?
1. Add Port 443 to the Firewall
If you have a dedicated third-party firewall or one bundled with an antivirus, make sure to add a rule forPort 443to it.
2. Terminate the process using the port
If this works, but the process/app keeps usingPort 443on successive reboots, and you get an error code each time, it’s best to uninstall the app.
3. Uninstall conflicting applications
If this doesn’t work, use aneffective software uninstallerto remove all leftover files and Registry entries in case these are triggering conflicts.
4. Create a new subdomain
If the 443 error code is seen while installing Nextcloud from theofficial GitHub pageon a VPS (Virtual Private Server) where there are no software conflicts or thefirewall blocking to blame, you may create a new subdomain.
It doesn’t matter whether the encryption rate limit is hit or not. Creating an entirely new subdomain from scratch will do the trick!
5. Contact your ISP
In some of the cases we examined, it was the Internet Service Provider (ISP) that was blockingPort 443, and as a result, you were getting the error code. This is often done for security reasons.
So, check with them, and if it turns out thatPort 443is blocked, ask for it to be unblocked.
These fixes and workarounds should help get rid of the 443 error code. Remember, some work in specific situations while others are generally accessible. For instance, addingPort 443to the firewall will work across setups, while creating a new subdomain is specific to Nextcloud.
Also, issues withPort 443can cause theCould not open connection to the hostTelnet error, and if the problem with your PC is related to it, check our fixes!
For any queries or to share what worked in your case, drop a comment below.
More about the topics:network error,ports,windows server
Kazim Ali Alvi
Windows Hardware Expert
Kazim has always been fond of technology, be it scrolling through the settings on his iPhone, Android device, or Windows PC. He’s specialized in hardware devices, always ready to remove a screw or two to find out the real cause of a problem.
Long-time Windows user, Kazim is ready to provide a solution for your every software & hardware error on Windows 11, Windows 10 and any previous iteration. He’s also one of our experts in Networking & Security.
User forum
0 messages
Sort by:LatestOldestMost Votes
Comment*
Name*
Email*
Commenting as.Not you?
Save information for future comments
Comment
Δ
Kazim Ali Alvi
Windows Hardware Expert
Kazim is specialized in hardware devices, always ready to remove a screw or two to find out the real cause of a problem.
