paste.opensuse.org is currently down.
Workaround: use susepaste.org. For existing links to paste.opensuse.org, replacing the domain with susepaste.org will work and give you the pasted content.
It turned out that news.opensuse.org and lizards.opensuse.org send out cookies with a cookie domain of "*.opensuse.org", and one of these cookies breaks paste.opensuse.org.
We'll restrict the cookie domain, but until this is done, you can delete your news.opensuse.org cookies to "fix" paste.opensuse.org. Note that this will only last until you visit news.opensuse.org again (until we have fixed the cookie domain there).