Technologies

404 and 503 decoded: Here’s what those pesky internet error fails really mean

You can’t load a webpage you want, but those error codes are trying to tell you something. We’ll help you figure out what to do next.

It was Feb. 16 and I had two alarms set on my phone for Beyoncé’s Formation tour tickets. As they were bound to sell out in minutes, I was on the website, ready to refresh the page as soon as the clock struck 10 a.m. But when the critical moment came, the page only showed an ominous message: «503? Service requested is unavailable?» I refreshed the page frantically. What if I couldn’t get the tickets? Who knew when Beyoncé would tour again? But I got the same error over and over again.

I picked up my phone hoping to have more luck there, but I got the same message. Finally, after what felt like a bazillion refreshes and clicks, I was able to get through. There they were — the tickets I had been waiting months for. Whew! The purchase confirmation screen appeared and the nightmare ended. But I kept asking myself where that message came from. Was it something I did, or was the website just borked?

Those random-seeming website error numbers like 404, 503 and 301 you sometimes see after typing a URL can throw you off your groove or worse, ruin an urgent task (like buying Beyoncé tickets). Sometimes, like if you mistyped the URL, a simple text change can put you back in business. Other times, there may be a bigger issue — the server is down or there’s an internet outage.

To help you understand what to do the next time you see one of these online uh-ohs, I’ll break down the basics of those strange codes — even the ones that you might not be able to crack on your own. And if you’re fascinated by all of the code-lingo, you can always dig in deeper with a coding course for beginners.

404s and other common website errors: What they mean

Some website error codes are your fault (oops), but others are because of problems with the server that only the website’s administrator can fix. Chances are, you’ll see them with every refresh — it might help keep your annoyance at bay to understand why (but I doubt it).

404: One of the most common errors you’ll see, it means the page cannot be found. Nowadays, some sites will design its error code pages with cute puppies, links to other pages or a funny illustration to lighten your no doubt frustrated mood. Double-check the URL for typos and try again. If you’re typing the correct URL and you still have no luck, the page has been moved or deleted.

301: You may have heard of a «301 redirect,» but probably have never seen this code displayed on a site. Think of it as a smooth transition from one old URL to a new one, sort of like forwarding your mail. You should still see the webpage you wanted when this happens, but it likely has a different URL than the one you entered. It’s a permanent move, and even if you use the old URL, you’ll still be automatically routed to the new one. Bookmark the new URL for future reference.

400: This one is best known as a «bad request» for the user. On Google Chrome, you’ll get the message, «This page isn’t working at the moment» along with some guidance about contacting the website administrator. Usually, it’s caused by an error on your end. There may be a typo in the URL, the server may not understand your request, or the file you’re trying to upload is too big. Try clearing your cache and checking the URL for typos. If you have no luck, take Google’s advice.

410: This is the «Gone» status. You may see a message like, «This page does not exist,» or «Page deleted or gone.» There’s no problem on your end — you’ve got the right page, but the website administrator may have deleted it for good.

451: This code blocks you from seeing a URL for various legal reasons. According to a developer resource page from Mozilla (the maker of the Firefox browser), a person or organization may have made a legal demand to remove the content or the page may be blocked because of government censorship. You should see the legal reason on the page with the status code, but it’s not always guaranteed. If you’re determined to see the content, you may be able to get there with a few tech-savvy tactics — like a VPN or proxy server that acts as a tool to bypass the server’s restrictions.

503: You’ll likely see the message, «503 Service unavailable,» when a website’s server is down, so you won’t be able to access the site until it’s fixed. Reason being, the site’s server could be down for maintenance, too many people may be causing the site to overload, the site could have a bug or someone looking to cause trouble has taken the site offline. You won’t be able to access the site until it’s fixed so it’s best to try again later to see if the server issue is resolved.

200: This code you won’t see because it means that everything is OK. The site, its server and your browser are all working fine, so there’s no need to alert you there’s not a problem. The only place you’ll likely see it is in the code (or back end). In fact, most codes that start with a 2 are a good sign that the communication channel between your browser and the company’s server is working.

How can I fix website codes with images and videos?

It can be frustrating if you’re trying to play a video, upload or download media, but see error codes instead. More often than not it’s a user error, and it’s up to you to fix the problem. Sometimes you’ll see a small icon that looks like a picture in place of the video or image you’d hope to see. In that case, you’ll know something’s wrong.

If you get status code 415, it’s a red flag that the server doesn’t recognize the file type you’re using. Popular photo- and video-sharing sites will list the file types they support, typically on the Support page (here’s the list for YouTube). If yours isn’t listed, try converting the file to one of the approved formats before uploading it again.

Front end developer Allan Hernandez says that most common supported types are .mp3 and .mp4 for videos and .jpeg, .png, .svg and .web for images. If you’re uploading a video or image using one of the correct file formats, he says, it should be easy and error-free.

Another common problem occurs when you try to upload files that are too big for the server, also known as status code 413. In this case, it’s best to reduce the file size before uploading again.

Here are a few other common error codes you may come across with media and what they mean.

404: The media file has been moved or deleted.
403: The server cannot access your image or video — possibly because the firewall is blocking it.
429: You may have sent too many requests without giving the server time to process them. So, if you’ve clicked «upload» a bazillion times, you may get this code.

Are any errors my fault that I can fix?

Yes, there are two types of code errors: client and server. Most client errors start with a 4. You’ll need to fix something on your end before continuing. For example, the 403 code may mean the page is forbidden, or the web administrator restricts access to that page. You’ll need to go to another page or site.

Usually, if there’s an error, you’ll need to do one of these things.

1. Restart your computer, modem or router.

2. Check the URL for typos.

3. Visit a different URL.

Sometimes, other actions may be required, such as you need to pay to see gated content or, if you’ve clicked a button constantly, you just need to wait patiently because the request isn’t processing fast enough.

If an error starts with a 5, it’s the server’s problem and there may not be much you can do. Try contacting the website’s support to let them know you’re getting a server error.

Technologies

You Can’t Trust Your Car’s Driving Assistance System Yet, AAA Report Finds

Both hands-on and hands-off systems required human intervention to avoid accidents in this study.

Technologies

Google’s AI Mode Is Getting New Agentic Features for Restaurant Reservations and More

AI Mode can now do most of the work to find dinner reservations for you.

Google’s AI Mode is getting new agentic capabilities and expanding to 180 new countries and territories around the world, Google announced Thursday. AI Mode allows you to ask questions directly to Google and it’ll kick off a series of searches on your behalf. From there, it will surface relevant information to your query without the need to do any of the deep research yourself. It changes the way you search for things online, and it’s getting even smarter with this latest rollout.

Powered by DeepMind’s Project Mariner, the latest additions bring us further into the agentic AI future we’ve been promised for some time, directly from a search box. Instead of just finding things for you, AI Mode can now do things for you, like finding dinner reservations, flights or concert tickets. The update also brings personalized recommendations and link-sharing capabilities for easier collaboration with friends and family.

Most of the new features are either limited to premium AI subscribers and tucked behind an experiment in Google Labs, but it might not take long before they’re a standard part of your future search experience.

Google did not immediately respond to CNET’s request for further comment.

Restaurant recommendations

Instead of searching for restaurant reservations and then clicking on a specific website to make a reservation, AI Mode surfaces everything you need to complete the action right there. Since it’s contextually aware, you can add specificities to your query that a typical Google search wouldn’t handle well.

You can add the type of cuisine, number of people, time and location to a single query, and AI Mode will get to work and display real-time restaurant reservation time slots to choose from.

Google says it’s partnered with OpenTable, Resy, Tock, Ticketmaster and several other companies to make finding and doing what you want easier, since you won’t have to put in the legwork yourself.

This feature is currently rolling out to Google AI Ultra subscribers in the US who have enabled the specific experiment in Labs.

Personalized recommendations

Another experiment that’s currently available in the US (that also needs to be enabled in Labs) is personalized recommendations. Google says it’s starting with dining-related recommendations, which implies more options will be on the way in the future.

The experiment will use your past conversations with AI Mode, places you’ve interacted with on Search and Maps to provide suggestions tailored specifically to you.

Share AI Mode links with others for collaboration

If you’re planning a vacation or a party, you can now share your research directly with others with a new link-sharing feature built into AI Mode. People who interact with the link will be sent to the last response sent by AI Mode and can continue the conversation on their own to do more exploration on the topic. The original sender of the links can manage them and delete them at any time.

For more, don’t miss everything Google announced at its Pixel 10 event.

Technologies

IPhone or Android, Here’s How to Finally Escape That Endless Group Chat

Done with a group chat? Here’s how to ghost it on any service.

One reason people prefer group chats in Apple’s iMessage or RCS texting is the extra control and security these platforms provide. If everyone in your group is using iPhones, or if you’re on Android chatting through RCS, you’ll get features like typing indicators, high-quality media sharing, and the option to mute or leave a conversation when you need fewer notifications.

The biggest advantage is privacy. Both iMessage and RCS group chats offer end-to-end encryption, so your conversations stay secure. The only time that doesn’t apply is when a thread includes a mix of iPhone and Android users, which limits encryption support.

Knowing these differences can help you manage your chats more effectively, whether you’re keeping up with friends, planning events, or just looking for a little more control over your notifications.

And with RCS support with iOS 18, group chats that include a mix of iPhone and Android participants have more features than ever — but it’s not at the level you’ll experience when a conversation is fully on iMessage or Google Messages. «Green bubble chats» from an iPhone to an Android phone can now include typing indicators, higher-quality media and easier group chats.

However, RCS conversations between the iPhone and Android phones don’t include encryption now, but it should be added in a future update. This will hopefully give these conversations a similar level of privacy that we expect when using chat services like iMessage, WhatsApp or Signal.

Regardless of how you’re in a group chat with others, you can leave a chat. Here are the steps to leave any conversation from your phone’s texting app, regardless of whether it’s happening on iMessage, RCS or as a mixed MMS chat.

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Leaving group chats on an iPhone

You can leave group conversations on your iPhone in two ways. You can either mute a chat,which keeps you in a conversation but you no longer receive notifications about it, or you can outright leave and no longer have access to the chat.

On an iPhone, open Messages and go to the chat thread you want to leave. At the top of the screen are conversation controls, a group of icons with the participants. Tap this to open a pop-up menu. As long as your conversation has four or more participants, iOS gives you the ability to tap Leave this Conversation with red text. If your chat has three or fewer participants, though, the option is grayed out, but you can tap Hide Alerts to prevent the conversation from notifying you further. Tapping Hide Alerts also allows you to mute a conversation, letting you keep access to a chat without necessarily leaving it. These steps apply to both iMessage conversations and to those over RCS.

Hide and block MMS chats on an iPhone

Although you can’t officially leave MMS group chats, you can hide or block the conversation. It’s not as good as outright leaving a conversation (other participants will still see you as in it), but you at least have no personal evidence of the conversation continuing.

On an iPhone, visit the group chat and tap the conversation controls. Instead of seeing Leave this conversation, you will see the option to Delete and Block this conversation. If you’d rather just mute the conversation instead of deleting and blocking it, you can hit Hide Alerts to mute it.

Leave group chats on an Android phone

On an Android phone using Google Messages, visit the chat thread you want to leave. Tap the conversation’s name to bring up the Group Details menu. Within this menu is the Leave Group button. Unlike with iMessage, you can leave chats with as few as three participants.

If you want to just mute notifications, tap Notifications on the Group Details screen to bring up a window with notifications controls. This includes options to make the conversation stay Silent to prevent it from ringing your chat, and if you tap Lock Screen, a pop-up menu will give you the option to prevent notifications. Tap Don’t show notifications at all to enable.

Hide and block MMS chats on an Android phone

On an Android phone with Google Messages, follow the same steps to access options for controlling notifications. This includes visiting the MMS chat thread and then tapping either the name of the conversation or the names of the participants at the top to bring up the Group Details menu. You won’t see a Leave Group option like you did with an RCS thread, but you do get the same ability to tap Notifications to access controls for hiding the conversation. This includes the same options for turning the conversation to Silent and to select Don’t show notifications at all.

SMS vs. MMS vs. RCS

SMS stands for Short Message Service and debuted in 1992. Text messages are limited to 160 characters. MMS stands for Multimedia Messaging Service and supports sending photos, videos or other files and messages longer than 160 characters. MMS supports a group of people chatting in a single conversation thread, while SMS can text multiple people at once but is sent as individual messages to each person. RCS, which launched 15 years ago, is short for Rich Communication Services and can show typing indicators, read receipts and has end-to-end encryption.

While cross-platform chat apps like WhatsApp, Signal and Telegram have better controls for conversations, encryption and privacy, regardless of the type of phone participants are using, they don’t support SMS, MMS or RCS. That’s why the default messaging app on most phones is still widely used, even if it means that a group chat is on a less feature-filled, unsecured standard like MMS.