HTTP/1.1 INTERNAL SERVER ERROR:
There is no clearly-defined cause or solution for this
error code. The way I comprehend it, it appears like
there is a momentary breakdown in communication
in between your computer and a server somewhere,
either YouTube's, your ISP's, or possibly one of the
routes which your uplink would take. That's why it's
called a "1.1" -- because nobody really knows.
Here's what I was able to find for you on Microsoft's
support website. I have also included for you the full
URL address, followed by its direct link.
Although what's described below mentions firewalls
often, I'm sure that is not your issue, otherwise you
would have already received lots of 1.1 messages a
while ago. I'm also pretty sure that whatever firewall
you have "supports HTTP 1.1 packets".
CAUSE:
This issue can occur because the Hypertext Transfer
Protocol (HTTP) 1.1 is used with Internet Explorer 5
and later to gain access to OWA, and the HTTP 1.1
protocol is not supported by all firewalls. If the HTTP
1.1 protocol is not supported by the firewall, certain
packets from the client are blocked and you receive
the error message in the "Symptoms" section of this
article.
RESOLUTION:
To resolve this issue, implement a firewall solution
that supports HTTP 1.1 packets.
WORKAROUND:
Modify the firewall so that the firewall passes all the
HTTP packets regardless of the protocol.
support . microsoft . com / kb / 267910
http://support.microsoft.com/kb/267910
If you read the bulletin further down, it says that this
problem supposedly applies to "Microsoft Exchange
Server 2003, Enterprise and Standard Editions" and
"Microsoft Exchange Server 2000". Surely you don't
have any of those in your computer.
Like I stated above, I think your trouble is temporary
and should thus resolve itself rather fast.
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500 INTERNAL SERVER ERROR:
I thought I'd do some big-time searching on the internet
for you, and here is what I was able to find out:
Apparently, it looks like the 500 Internal Server Error is
a general HTTP status code, meaning that it cannot be
more specific about what the exact problem is. But it's
a "server-side" error. That means the problem isn't with
your computer or your internet connection, but instead
with YouTube itself and its "host server".
Here is my slimmed-down re-written adaptation of what
one advice column says: "Even though the issue is not
yours to troubleshoot or resolve, there are some things
you can do: Retry the web page by clicking the refresh
button or try using the URL from the address bar again.
Although the 500 Internal Server Error is a general error
from the website's servers instead of on your computer,
the server error may only be temporary. Trying the web
page again will often be successful."
Here's the complete web URL of my reference -- which
I've written-out in full for you -- followed by its direct link:
pc support . about . com / od / find by error message / a / 500 server error . htm
http://pcsupport.about.com/od/findbyerrormessage/a/500servererror.htm
I hope that my answer proves somewhat helpful for you.