Ktorrent keeps on "invalid response", "timeout contacting tracker ....." and "announcing".
But the torrent is valid. I just download successfully under win7 uTorrent.
Try again using KTorrent but same, keeps on "invalid response", "timeout contacting tracker ....." and "announcing".

It happens for some torrent only. Some other torrent works fine.
am using KTorrent 4.3.1

~/.kde4/share/apps/ktorrent/log says

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Mon Aug 19 22:41:24 2013: Error : Timeout contacting tracker http://tracker.openbittorrent.com/announce
Mon Aug 19 22:41:24 2013: Error : Timeout contacting tracker http://tracker.prq.to/announce
Mon Aug 19 22:41:24 2013: Error : Timeout contacting tracker http://tracker.publicbt.com/announce
Mon Aug 19 22:41:35 2013: UDPTracker::error : Timeout contacting tracker udp://tracker.ipv6tracker.org:80/announce
Mon Aug 19 22:42:05 2013: Doing tracker request to url : udp://tracker.ipv6tracker.org:80/announce
Mon Aug 19 22:42:05 2013: Send error : Network is unreachable
Mon Aug 19 22:42:05 2013: Send error : Address family not supported by protocol
Mon Aug 19 22:42:15 2013: FreeBytes 44.23 GiB
Mon Aug 19 22:42:15 2013: Downloaded 0 B
Mon Aug 19 22:42:15 2013: Remaining 748.25 MiB
Mon Aug 19 22:42:24 2013: Stalled for too long, time to get some fresh blood
Mon Aug 19 22:42:24 2013: Doing tracker request to url (via QHttp): http://btfans.3322.org:6969/announce?peer_id=-KT4310-KMpSn5BeuXmI&port=6881&uploaded=0&downloaded=0&left=784597305&compact=1&numwant=200&key=1127053024&event=started&info_hash=%ac%e4H%96%90%c7.JKDe%084%d9Y%a8%eeU%a6%9d
Mon Aug 19 22:42:24 2013: Request sent
Mon Aug 19 22:42:24 2013: Doing tracker request to url (via QHttp): http://denis.stalker.h3q.com:6969/announce?peer_id=-KT4310-KMpSn5BeuXmI&port=6881&uploaded=0&downloaded=0&left=784597305&compact=1&numwant=200&key=1127053024&event=started&info_hash=%ac%e4H%96%90%c7.JKDe%084%d9Y%a8%eeU%a6%9d
Mon Aug 19 22:42:24 2013: Request sent
Mon Aug 19 22:42:24 2013: Doing tracker request to url (via QHttp): http://tracker.openbittorrent.com/announce?peer_id=-KT4310-KMpSn5BeuXmI&port=6881&uploaded=0&downloaded=0&left=784597305&compact=1&numwant=200&key=1127053024&event=started&info_hash=%ac%e4H%96%90%c7.JKDe%084%d9Y%a8%eeU%a6%9d
Mon Aug 19 22:42:24 2013: Request sent
Mon Aug 19 22:42:24 2013: Doing tracker request to url (via QHttp): http://tracker.prq.to/announce?peer_id=-KT4310-KMpSn5BeuXmI&port=6881&uploaded=0&downloaded=0&left=784597305&compact=1&numwant=200&key=1127053024&event=started&info_hash=%ac%e4H%96%90%c7.JKDe%084%d9Y%a8%eeU%a6%9d
Mon Aug 19 22:42:24 2013: Request sent
Mon Aug 19 22:42:24 2013: Doing tracker request to url (via QHttp): http://tracker.publicbt.com/announce?peer_id=-KT4310-KMpSn5BeuXmI&port=6881&uploaded=0&downloaded=0&left=784597305&compact=1&numwant=200&key=1127053024&event=started&info_hash=%ac%e4H%96%90%c7.JKDe%084%d9Y%a8%eeU%a6%9d
Mon Aug 19 22:42:24 2013: Request sent
Mon Aug 19 22:42:24 2013: Doing tracker request to url : udp://tracker.ipv6tracker.org:80/announce
Mon Aug 19 22:42:24 2013: Send error : Network is unreachable
Mon Aug 19 22:42:24 2013: Send error : Address family not supported by protocol
Mon Aug 19 22:43:15 2013: FreeBytes 44.23 GiB
Mon Aug 19 22:43:15 2013: Downloaded 0 B
Mon Aug 19 22:43:15 2013: Remaining 748.25 MiB
Mon Aug 19 22:43:24 2013: Error : Timeout contacting tracker http://tracker.openbittorrent.com/announce
Mon Aug 19 22:43:24 2013: Error : Timeout contacting tracker http://tracker.prq.to/announce
Mon Aug 19 22:43:24 2013: Error : Timeout contacting tracker http://tracker.publicbt.com/announce
Mon Aug 19 22:43:24 2013: UDPTracker::error : Timeout contacting tracker udp://tracker.ipv6tracker.org:80/announce

Does your network require a proxy to function?

thank you for reply.
no I don't think I am using a proxy.
I am using a router though.
Here is my ifconfig

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wlan0     Link encap:Ethernet  HWaddr 8C:A9:82:7B:62:0E 
          inet addr:192.168.0.104  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::8ea9:82ff:fe7b:620e/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:51392 errors:0 dropped:0 overruns:0 frame:0
          TX packets:17191 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:67066569 (63.9 Mb)  TX bytes:2750887 (2.6 Mb)


I'm not sure why this occurs unfortunately - it could be KTorrent is simply not compatible with certain trackers somehow, or they have blacklisted KTorrent.

It's alright. Thank you for taking the time answering.

just to provide further info.
installed transmission and successfully downloaded. ktorrent does not download.

here is an example of the torrent (at bottom of 1st post).
http://www.txzqw.com/read-htm-tid-250336.html