squid代理 很多网站需要刷新才能进去

ie浏览器的错误信息
The requested URL could not be retrieved

--------------------------------------------------------------------------------

While trying to retrieve the URL: http://www.chinaunix.net/

The following error was encountered:

Unable to determine IP address from host name for www.chinaunix.net
The dnsserver returned:

No DNS records
This means that:

The cache was not able to resolve the hostname presented in the URL.
Check if the address is correct.
Your cache administrator is root.

squid信息
HTTP/1.0 200 OK
Server: squid/2.5.STABLE6
Mime-Version: 1.0
Date: Wed, 13 Aug 2008 07:37:08 GMT
Content-Type: text/plain
Expires: Wed, 13 Aug 2008 07:37:08 GMT
Last-Modified: Wed, 13 Aug 2008 07:37:08 GMT
X-Cache: MISS from liaohedigital.com
Proxy-Connection: close

Squid Object Cache: Version 2.5.STABLE6
Start Time:     Tue, 12 Aug 2008 10:15:17 GMT
Current Time:   Wed, 13 Aug 2008 07:37:08 GMT
Connection information for squid:
        Number of clients accessing cache:      126
        Number of HTTP requests received:       985745
        Number of ICP messages received:        0
        Number of ICP messages sent:    0
        Number of queued ICP replies:   0
        Request failure ratio:   0.00
        Average HTTP requests per minute since start:   769.0
        Average ICP messages per minute since start:    0.0
        Select loop called: 48265382 times, 1.594 ms avg
Cache information for squid:
        Request Hit Ratios:     5min: 24.5%, 60min: 26.0%
        Byte Hit Ratios:        5min: 8.7%, 60min: 5.1%
        Request Memory Hit Ratios:      5min: 15.9%, 60min: 12.8%
        Request Disk Hit Ratios:        5min: 14.7%, 60min: 17.0%
        Storage Swap size:      1740388 KB
        Storage Mem size:       101708 KB
        Mean Object Size:       17.79 KB
        Requests given to unlinkd:      33667
Median Service Times (seconds)  5 min    60 min:
        HTTP Requests (All):   0.07409  0.07014
        Cache Misses:          0.11465  0.10857
        Cache Hits:            0.00562  0.00463
        Near Hits:             0.08265  0.07409
        Not-Modified Replies:  0.00286  0.00179
        DNS Lookups:           5.21428  4.98804
        ICP Queries:           0.00000  0.00000
Resource usage for squid:
        UP Time:        76911.352 seconds
        CPU Time:       14151.338 seconds
        CPU Usage:      18.40%
        CPU Usage, 5 minute avg:        51.94%
        CPU Usage, 60 minute avg:       49.73%
        Process Data Segment Size via sbrk(): 168600 KB
        Maximum Resident Size: 0 KB
        Page faults with physical i/o: 0
Memory usage for squid via mallinfo():
        Total space in arena:  168600 KB
        Ordinary blocks:       163652 KB  37843 blks
        Small blocks:               0 KB      0 blks
        Holding blocks:           332 KB      2 blks
        Free Small blocks:          0 KB
        Free Ordinary blocks:    4947 KB
        Total in use:          163984 KB 97%
        Total free:              4947 KB 3%
        Total size:            168932 KB
Memory accounted for:
        Total accounted:       134401 KB
        memPoolAlloc calls: 113362678
        memPoolFree calls: 112677606
File descriptor usage for squid:
        Maximum number of file descriptors:   1024
        Largest file desc currently in use:    930
        Number of file desc currently in use:  689
        Files queued for open:                   0
        Available number of file descriptors:  335
        Reserved number of file descriptors:   100
        Store Disk files open:                   0
Internal Data Structures:
         98578 StoreEntries
         18160 StoreEntries with MemObjects
         17884 Hot Object Cache Items
         97849 on-disk objects


free
             total       used       free     shared    buffers     cached
Mem:       1032420    1027964       4456          0      72404     653804
-/+ buffers/cache:     301756     730664
Swap:      2008116        608    2007508



top
top - 16:38:09 up 23:26,  5 users,  load average: 1.33, 0.92, 0.78
Tasks:  95 total,   2 running,  93 sleeping,   0 stopped,   0 zombie
Cpu(s): 23.4% us, 31.2% sy,  0.0% ni, 26.6% id,  2.9% wa,  5.2% hi, 10.7% si
Mem:   1032420k total,  1027116k used,     5304k free,    72852k buffers
Swap:  2008116k total,      608k used,  2007508k free,   651052k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                                          
5540 squid     16   0  172m 159m 1788 R 61.6 15.8 263:55.23 squid