400:
Bad requestThe address you typed is somehow incorrect. The URL may not exist or you may not have authority to access the document on the server.
What you can do
Check that you typed the URL correctly. Remember that Internet addresses are case sensitive, so www.extra.com.au/HOLIDAYS is not the same as www.extra.com.au/holidays. If you’re not used to typing URLs, it’s very easy to leave out the correct punctuation or to substitute a slosh (\) for a slash(/). Computers are very finicky about this stuff. If you’re trying an address you found elsewhere –perhaps in a magazine or on a Web site – it’s possible that the original author got it wrong. You might want to check the capitalization or try just the first part of the address. For instance, if you can’t get to www.extra.com.au/Holidays, try www.extra.com.au by itself, and then see if you can manually navigate to the Holidays page.
You’re treading on restricted ground. The page you’ve tried to access is only available to people authorized by the host or those with the correct password. Sites can also restrict access to those people who are connecting from a particular domain: for instance, you might only be able to access a site if you connect via a .edu or .gov domain or via a particular country domain.
What you can do
If you know you should have access to the site, check the spelling of your password, including the case.
This is very like 401. The page you’re trying to view is password protected or restricted in some other way.
What you can do
If you have the password for the site, check the spelling. If you still can’t get in, you may need to e-mail the site’s Webmaster.
The particular page you’re looking for can’t be found on the server. It may be that the page no longer exists (remember, the Web is a very volatile place and no page lives forever) or that it’s been moved to another location or renamed.
What you can do
Once again, check the spelling of the URL. You can also try going up one or more levels and seeing if you can locate the page that way. For instance, if you’re looking for www.microsoft.com/ie/IE40/security.asp and can’t seem to find it, try www.microsoft.com/ie/IE40 and, if that doesn’t help, try www.microsoft.com/ie and finally www.microsoft.com. Once you manage to load a page, you can then try navigating your way to the page or using the site’s search facility, if it has one, to locate the page you want.
There’s something wrong at the Web site itself. As their server is not functioning correctly, it’s unable to provide you with the requested Web page.
What you can do
Contact the site’s Webmaster or administrator, or try again later in the hopes that they have noticed the problem and fixed it themselves.
502:
Service temporarily overloaded
This one’s fairly self-evident: so many people are accessing the server that it can’t handle the load.
What you can do
Try again later. If it’s a very high-traffic site, try accessing it at a time when most people are likely to be asleep. If it’s an US-based site, this is pretty easy to accomplish.
This is a “temporarily out of order” sign, and it’s sometimes reported as Gateway timeout. It means either the server that hosts the site is currently not working or is unavailable, your ISP’s server is down, or your own system or company Internet gateway (if you’re on a LAN) is not working.
What you can do
Wait a minute and try again. If you get the message for a lengthy period or with every attempt to connect to any site, check that your PC and LAN connections are functioning, and then check with your ISP or the remote site. This may entail a phone call to their tech support line.
You’ve requested a page that contains a form with a feature your browser can’t support.
What you can do
Let the Webmaster know the form is unusable.
Connection
refused by host
Like the Forbidden and Unauthorized messages, this one usually means you’ve
tried to access a password-protected site or one that’s restricted to users
from particular domains.
What you can do
If you have the password, check that you typed it correctly and try again. If it still won’t work, contact the Webmaster.
Failed
DNS lookup Or DNS not found
You’ve typed a URL that can’t be converted into a valid Internet address.
The ‘DNS’ in this message stands for domain name system (or service).
Addresses on the Internet take the form of a string of numbers. For instance,
www.ribbonet.com.au is the domain name of this Web site; 203.22.70.2 its Internet
address. Because we, as humans, tend to handle names more easily than strings
of numbers, we type in the domain name, which is looked up in a table and matched
to its corresponding, computer-friendly, Internet address. In the case of a
failed DNS lookup, the domain name can’t be found in the table.
What you can do
Check that you typed the URL correctly. If you did, wait a few seconds and try again.
File
contains no data
You’ve connected to a server that doesn’t have any Web documents on
it.
What you can do
Try the URL once more. If you still get the same message, try again later: it may be that you’ve stumbled onto the site just as it’s being updated.
Host
unavailable
The site’s server is currently down.
What can you do
Try again a few times. If you still can’t get in, the site may be down for maintenance. Try again later.
Host
unknown
It could be that the site’s server is down (as with the previous message)
or that your modem lost the connection.
What you can do
First try re accessing the site by hitting the Reload button. Make sure you’ve typed the URL correctly and that you’re still online.
Network
connection was refused by the server
This usually means you’ve come across an overworked server that can’t
handle any more users. This is the message you get if the server hasn’t
been set up to display the more informative “Service temporarily overloaded”
message.
What you can do
Try again. If you still don’t get on, be patient and try again later.
NNTP
server error
This is a Usenet newsgroup error message. You’ll come across it when you’re
trying to join a newsgroup but can’t get access.
What you can do
First, make sure you typed the newsgroup address correctly. If you did, try again later.If you still can’t get on, it may be that your ISP doesn’t provide access to that particular newsgroup – you’ll need to contact your ISP to find out and, perhaps, ask to have it added.
Permission
denied
This is an FTP message, which you’ll see if you try to upload a file to
an FTP site and the site administrator doesn’t want you to. You may also
see it if you try to download a file using the wrong syntax or simply when the
site is too busy to handle an upload.
What you can do
Check that you’re using the correct syntax. If so, try again later. If you still can’t upload the file, contact the site’s administrator.
Server
returned extended information
This one usually pops up when you try to access a file download or file download
site that’s very busy.
What you can do
While the browser message is not very informative, if you’re using an FTP program you’ll probably see the much more informative “There are too many anonymous FTP users using the site at this time. Please try again in a few minutes.” That’s exactly what you should do.
Too
many connections – try again later
You’re trying to access a site that’s already overwhelmed with visitors.
What you can do
Try again a few times and, if you still can’t get in, try again later.
Too
many users
This is the FTP equivalent of the too many connections message. FTP sites allow
a certain number of anonymous connections at any one time. If you try to log
on when that limit is reached, you’ll receive this message.
What you can do
Keep on trying. Remember, some of the really big download sites, such as Netscape and Tucows, have mirror sites elsewhere which make the same files available. If you are locked out of the main site by heavy traffic, see if you can find a mirror site to use.
Unable
to locate host
This is similar to the Host unknown message. It means the site’s server
is unavailable at the moment, or that you’ve lost the modem connection.
What you can do
Check the spelling of the URL and click Reload to see if you can get through. If not, make sure you’re online. You may need to wait and try later.
Unable
to locate the server
The particular server where the site is located cannot be found – either
it no longer exists or you’ve got the URL wrong.
What you can do
Check your spelling.
You
can’t log on as an anonymous user.
This is a message from an FTP site. Either the site doesn’t provide anonymous access, or it’s reached its limit for anonymous users.
What you can do
Try again later. If you’re using your browser to access the FTP site, make sure you’ve configured it correctly: most FTP sites require an ID of anonymous and your e-mail address as the password.
Helper
application not found or Viewer not found
Most browsers require additional programs to ‘view’ files such as
sound clips, video, 3D VRML pages, Zip (compressed) files, spreadsheets and
so on.
What you can do
The latest versions of the major browsers usually offer to install the required ‘viewer’ or ‘helper’ program automatically. If you want to view the file, click OK to install the program and follow the prompts. If your browser doesn’t prompt you for automatic installation, you’ll usually find the error message provides information about the type of file that can’t be viewed. Look for a reference to graphic, VRML, audio and so on.