This seems to something like my ongoing Wikipedia/Wikimedia problem. In last 12 hours most of queries to http://bits.wikimedia.org from my home IP are failed, but not all. However https://bits.wikimedia.org seems to work normally. I also asked in community portal of fiwiki if wikipedia has been slow and answer was  it has been worked normally.

Commands asked:

--- CLIP ----
curl -i http://bits.wikimedia.org/
curl: (7) Failed to connect to 2620:0:862:ed1a::a: Network is unreachable

--- CLIP ----
curl -i https://bits.wikimedia.org/
HTTP/1.1 200 OK
Server: nginx/1.1.19
Date: Wed, 08 May 2013 05:45:54 GMT
Content-Type: text/html
Content-Length: 178
Connection: keep-alive
Last-Modified: Thu, 12 Aug 2010 16:12:20 GMT
ETag: "b2-48da2a1772100"
X-Varnish: 693529009
Via: 1.1 varnish
Accept-Ranges: bytes
X-Varnish: 1488468153
Age: 0
Via: 1.1 varnish
X-Cache: strontium miss (0), cp3021 miss (0)

<html>
	<head><title>bits and pieces</title>
		<meta http-equiv="refresh" content="1;url=http://www.wikimedia.org/" />
	</head>
<body>
bits and pieces live here!
</body>
</html>

--- CLIP ----
curl -i http://bits.wikimedia.org/geoiplookup
HTTP/1.1 200 geoiplookup
Server: Varnish
Content-Type: text/javascript
Content-Length: 111
Last-Modified: Wed, 08 May 2013 05:58:57 GMT
Cache-Control: private, max-age=86400, s-maxage=0
Accept-Ranges: bytes
Date: Wed, 08 May 2013 05:58:57 GMT
X-Varnish: 2987799549
Age: 0
Via: 1.1 varnish
Connection: close
X-Cache: cp3022 miss (0)

Geo = {"city":"REMOVED","country":"FI","lat":"REMOVED","lon":"REMOVED","IP":"91.153.84.229","netmask":"24"}

--- CLIP ----
traceroute bits.wikimedia.org
traceroute to bits.wikimedia.org (91.198.174.233), 30 hops max, 60 byte packets
 1  kotiboksi.Elisa (192.168.100.1)  0.662 ms  0.861 ms  1.079 ms
 2  tkueur1.fi.elisa.net (91.153.48.1)  14.876 ms  15.553 ms  15.781 ms
 3  ge1-0-0.tkubra-p1.fi.elisa.net (139.97.9.13)  13.879 ms  15.328 ms  16.106 ms
 4  so7-2-0.esptnl-p1.fi.elisa.net (139.97.6.1)  19.842 ms  21.924 ms  22.199 ms
 5  ip-rr.hkika234.fi.elisa.net (139.97.0.162)  22.454 ms  23.130 ms  23.885 ms
 6  213.192.184.109 (213.192.184.109)  25.150 ms  17.379 ms  18.065 ms
 7  as0-0.bbr1.ams1.nl.eunetip.net (213.192.191.226)  54.601 ms  50.913 ms  47.484 ms
 8  * * *
 9  * * *
10  * * *
....

Discussion in community portal:
http://fi.wikipedia.org/wiki/Wikipedia:Kahvihuone_%28tekniikka%29#Wikipedian_hidastelu