Pidgin 2.5.5 cannot connect to yahoo server

Binary package hint: pidgin

im using pidgin 2.5.5, i found abnormal behavior with it.. i was connected and chat with my friends normally tonight.. but i can't connect to yahoo server in this morning.. no error message but my YM can't logged in (can't connect).. so i try to login with another tools like meebo & gyachi on the same computer and work normally..some body what happen with my pidgin?.
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pidgin debug log :
(09:19:46) account: Connecting to account MyYahooAccount
(09:19:46) connection: Connecting. gc = 0x8e3e1c8
(09:19:46) dns: DNS query for 'scs.msg.yahoo.com' queued
(09:19:46) dns: DNS child 5936 no longer exists
(09:19:46) dns: Created new DNS child 6064, there are now 1 children.
(09:19:46) dns: Successfully sent DNS request to child 6064
(09:19:48) dns: Got response for 'scs.msg.yahoo.com'
(09:19:48) dnsquery: IP resolved for scs.msg.yahoo.com
(09:19:48) proxy: Attempting connection to 76.13.15.32
(09:19:48) proxy: Connecting to scs.msg.yahoo.com:5050 with no proxy
(09:19:48) proxy: Connection in progress
(09:19:49) proxy: Connecting to scs.msg.yahoo.com:5050.
(09:19:49) yahoo: 96 bytes to read, rxlen is 116
(09:19:49) yahoo: Yahoo Service: 0x57 Status: 1
(09:19:49) yahoo: yahoo status: 12
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ping to yahoo server :
 ping scs.msg.yahoo.com
PING scs.msg.yahoo.com (76.13.15.36) 56(84) bytes of data.
64 bytes from cs108.msg.ac4.yahoo.com (76.13.15.36): icmp_seq=1 ttl=48 time=638 ms
64 bytes from cs108.msg.ac4.yahoo.com (76.13.15.36): icmp_seq=2 ttl=48 time=628 ms
64 bytes from cs108.msg.ac4.yahoo.com (76.13.15.36): icmp_seq=3 ttl=48 time=659 ms
64 bytes from cs108.msg.ac4.yahoo.com (76.13.15.36): icmp_seq=4 ttl=48 time=817 ms
64 bytes from cs108.msg.ac4.yahoo.com (76.13.15.36): icmp_seq=5 ttl=48 time=659 ms
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netstat :
tcp 0 0 xxx.xxx.xxx.xxx:49159 76.13.15.32:5050 ESTABLISHED
tcp 0 0 xxx.xxx.xxx.xxx:52467 68.180.217.8:5050 ESTABLISHED
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ProblemType: Bug
Architecture: i386
DistroRelease: Ubuntu 9.04
ExecutablePath: /usr/bin/pidgin
Package: pidgin 1:2.5.5-1ubuntu8.1
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: pidgin
Uname: Linux 2.6.28-13-generic i686