Safari/Preferences/Advanced — enable the Develop menu, then go there and Empty Caches. Quit/reopen Safari and test. Then try Safari/History/Show History and delete all history items. Quit/reopen Safari and test. You can also try try Safari/Clear History…. The down side is it clears all cookies. Doing this may cause some sites to no longer recognize your computer as one that has visited the web site.
Try setting up another admin user account to see if the same problem continues. Please post back on whether or not this worked. Also try the Safe Mode. Please post back on whether or not this worked.
Isolating an issue by using another user account
Safe Mode — About
If it works in the Safe Mode, try running this program when booted normally and then copy and paste the output in a reply. The program was created by Etresoft, a frequent contributor. Please use copy and paste as screen shots can be hard to read. Click “Share Report” button in the toolbar, select “Copy to Clipboard” and then paste into a reply. This will show what is running on your computer. No personal information is shown. If the log won’t post, try posting it in Pastebin and provide a link in a reply Pastebin
Etrecheck – System Information
Do you see this Safari error message while browsing certain websites on your Mac. If you are getting a blank Safari page displaying the following error message, then this article is for you.
Safari can’t open the page. The error is: “The operation couldn’t be completed.(kCFErrorDomainCFNetwork error 303.)” (kCFErrorDomainCFNetwork:303)
I was in fact having this problem. Whenever I visited archive.org, Safari would not load the site and just displayed this error message. Here is how I resolved this message:
What is kCFErrorDomainCFNetwork error 303?
This is a parsing error. More specifically, the server is giving this error message because of encoding problems. It is probably due to the fact that Safari is saving too much data for that particular web site (for me: archive.org). You may want to also read a recent article on how you can reset Safari.
How to fix:
Please try each steps until your issue is resolved:
1-Let’s clean the problematic site’s cookies and data:
- In the Safari app, click Safari and Preferences
- Click the Privacy tab
- Click the Manage Web Site Data button
- A new window will open and you will see a list of websites that stored data.
- Find the affected site (again this was archive.org for me), you can use the Search field to find easily.
- Select the domain
- And click the Remove button
- And click done.
Now try again opening the web site. Do you experience the same problem? If so, continue to the next step.
2–Start your Mac in Safe Mode. This is an easy process. Here is how:
Safe Mode will start your Mac in a basic state with only the original software that came with it. Some of the features of your Mac will not be available in Safe Mode. Here is how:
- Turn off your Mac
- Turn on your Mac and immediately after tuning on, press and hold the Shift key
- Keep holding the Shift key until you see the login window
- Release the key and login
- Now your computer is in Safe Mode
- Open Safari and test to see if this problem occurs. If not, exit Safe mode.
- To exit Safe Mode, restart your computer normally without pressing the Shift key. You could not start your Mac normally, read this article?
Did the tips above help you? Please leave a comment.
Dr. Serhat Kurt worked as a Senior Technology Director specializing in Apple solutions for small and medium-sized educational institutions. He holds a doctoral degree (or doctorate) from the University of Illinois at Urbana / Champaign and a master’s degree from Purdue University. He is a former faculty member. Here is his LinkedIn profile and Google Scholar profile. Email Serhat Kurt.
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What Is kCFErrorDomainCFNetwork Error 303?
kCFErrorDomainCFNetwork Error 303 is a network error for Mac. This particular error is concerning the Safari web browser, where it may fail to open a certain website. Victims who have reported it have also noticed this problem on iPhone and iPad as well.
Read this article to find out more information concerning the kCFErrorDomainCFNetwork Error 303 and what you can do to fix it.
On this page:
What Is kCFErrorDomainCFNetwork Error 303?kCFErrorDomainCFNetwork Error 303 SummarykCFErrorDomainCFNetwork Error 303 – What Are Its SymptomskCFErrorDomainCFNetwork Error 303 – How to Fix It?
kCFErrorDomainCFNetwork Error 303 Summary
| Name | kCFErrorDomainCFNetwork Error 303 |
| Type | Network Error / Browser Runtime Error |
| Short Description | May cause a lot of problems on Safari, concerning opening websites. |
| Symptoms | When you open a certain website, the message “kCFErrorDomainCFNetwork Error 303” appears. |
| Program | Safari on macOS |
| Fix Tool |
Try this fix to repair your Mac from errors and optimise system performance:
Download SpyHunter |
kCFErrorDomainCFNetwork Error 303 – What Are Its Symptoms
kCFErrorDomainCFNetwork Error 303 is a typical network or a runtime error. Other errors similar to it may also include -2100F, -2003F and 1008F.
kCFErrorDomainCFNetwork Error 303 is the type of problem, which has been noticed on Apple Discussions forums. Victims had the following to say concerning this error:
I keep getting the above error on a specific website. I clear the affected cookie and it allows me to visit the site once and then the error comes up again.
I have spoken to the owner of the site and they keep saying to use another browser but I am running my business all on apple kit and want to keep it to Safari. I get the issue on my iPhone and iPad as well.
The link works without any issues in Chrome on all devices.
Appreciate any help
Regards
Jonathan
If you see this kCFErrorDomainCFNetwork Error 303, you may also experience the following symptoms:
- Internet speed starts slowing down.
- Your device may behave erratically.
- Some of your other apps may stop functioning.
kCFErrorDomainCFNetwork Error 303 is the type of error, that may be caused by several different reasons. It may be due to faulty code or even malware running on your Mac.
kCFErrorDomainCFNetwork Error 303 – How to Fix It?
According to experts on community forums, the following fixes were able to fix the problems, related to this error.
- Open Preferences in Safari.
- From there, go to Privacy.
- Search for the website that you are trying to open.
- Click on “Remove” and the problem should be fixed.
If this fix does not help, you can also try the following repairs.
Step 1: Close any apps or programs that may be in conflict.
When you get errors, like this one, often conflicting apps may be the case. Below, you can find the solutions for closing conflicting apps for Windows and macOS:
For macOS:
Go to Activity Monitor, mark any processes you believe are suspicious and close them by clicking the “X” button on top left above them.
After you have done this fix, you should observe if this error will show up again if you start and stop a specific process.
Step 2: Update and Re-install Any Software You Believe is Problematic.
For macOS:
Go to Applications and drag the icon of your program to Bin to uninstall it. For macOS, you can go to your AppStore and click on the “Updates” tab to check if any applications are out of date.
Step 3: Install the latest updates of your OS.
For macOS:
Go to System Preferences – Software Update and check for a newer macOS version. You will see a button to install it and Upgrade if its available.
Step 4: Scan your computer for errors and optimise it automatically.
If you have tried most of the fixes, but you keep getting error messages, then the best advice to go for is to make sure and check your computer for:
- Viruses.
- Tracking cookies and other pesky and harmful objects.
- Problematic files.
- Unwanted software.
- Adware.
- Browser Hijackers.
- Other errors that may be slowing it down.
You can do all of this by running an automatic scan of your computer using a professional anti-malware software. Such an advanced tool is created by cybersecurity and tech experts and is guaranteed to help detect and delete any malicious files and whatever may be causing errors and optimise your computer to make it fast again:
Spy Hunter scanner will only detect the problem. If you want the issue to be automatically removed, you need to purchase the full version of the anti-malware tool.Find Out More About SpyHunter Anti-Malware Tool / How to Uninstall SpyHunter
Mac Errors – Frequently Asked Questions
What are Mac Errors?
Mac errors are faulty problems of macOS. They are different types, affecting various programs running on your Mac.
Since macOS is frequently updated, it is easier to fix such errors, due to the way this operating system is constructed.
What Do Mac Error Codes Mean?
Error Codes on Mac are how your macOS explains the different types of problems that can occur on it. The number of the Mac Error code pops up on your screen, and it shows you the error with some explanatory text to help you fix it.
These error codes exist for both small and bigger problems, and in some cases, they can mean that there is a significant issue with your device.
Why Do I See Errors On My Mac?
The reasons may vary. These can be due to a badly written code, faulty software, external app modifying your app, incompatibility, problems with the resources required to run the app, and even a Mac malware infection.
What Types of Mac Errors Exist?
Just like with Windows devices, there are some general error types with Mac as well, including:
- Runtime Errors – when you execute a program and it fails due to badly written code, incompatibility with the program and web servers or other problems, like malware.
- Logic Errors – something in the logic makes the program fail to return results.
- Arithmetic Errors – a type of logic error, which involves miscalculation due to an erroneous configuration or code that does not fit the same logic as the system reads it.
- Resource Errors – when your device does not meet the resources required to run a program or if the program is coded faulty, so it requires more resources than necessary.
- Interface Errors – when there is a difference between what an app is meant to do and what it actually does.
- Compilation Errors – when the compiler of a software fails to turn complicated code into a simple language, understandable by your Mac.
Which are The Most Common Mac Errors?
According to different sources and online forums, the most commonly encountered errors on Mac carry the following codes:
- Error Code 36 – when Finder fails to read or write a file on your Mac.
- Error Code 41 – caused by malware, outdated software or corrupted files and directories.
- Error Code 50 – when you fail to copy and paste a file onto another drive, like USB or an external SSD or HDD.
- Error Code 2003F – it shows up when you try reinstalling your macOS in Recovery Mode. Possible causes include bad sectors in the hard disk, malware, etc.
What to Do If I See a Mac Error?
If you see an error on your Mac, your first job is to check the meaning of it. Then, you can see reputable forums, like Apple Discussions or SensorsTechForum in order to find different types of fixes for the problem.
How to Stop Getting Mac Errors?
You cannot. As long as there are people writing the code, there will always be the human error factor. However, there are several measures that you can take in order to significantly reduce the chance of getting a Mac Error:
- Check and update your Mac and your Apps (if possible) to the latest version on a daily basis.
- Install a relevant and reputable anti-malware for Mac.
- Install an optimizer for your Mac, which will keep all your apps updated, remove junk software, and improve your Mac’s health.
- Only install apps from trusted sources.
Ventsislav Krastev
Ventsislav is a cybersecurity expert at SensorsTechForum since 2015. He has been researching, covering, helping victims with the latest malware infections plus testing and reviewing software and the newest tech developments. Having graduated Marketing as well, Ventsislav also has passion for learning new shifts and innovations in cybersecurity that become game changers. After studying Value Chain Management, Network Administration and Computer Administration of System Applications, he found his true calling within the cybersecrurity industry and is a strong believer in the education of every user towards online safety and security.
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