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TCP_MISS/502 Issue

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hi guys
i am trying to understand the TCP_MISS/502 issue. I have many proxy servers in production, all running ubuntu server 8.x to 10.x
in particular, i have one proxy server that has come up with the TCP_MISS/502 POST error. Internet Explorer just comes up with "Internet Explorer cannot display the web page" and the only error in Squid is the _MISS/502 POST error.
on my other proxy servers, the web site displays without any problems and their network setup is the same in terms of iptable rules. initially i thought it could be a squid version problem, but i have loaded the exact same version of squid on the server giving the error as another squid server that is working.
can anyone make heads or tails from the cache log below and possibly guide me with the other things to possibly check ? 


thanks in advance, gabriel
2011/02/17 20:27:02| parseHttpRequest: URI is 'http://www.sarsefiling.co.za/images/HomePage/Top_Login_Roll.jpg' 
Referer: http://www.sarsefiling.co.za/Default.aspx
Host: www.sarsefiling.co.za
Referer: http://www.sarsefiling.co.za/Default.aspx
Host: www.sarsefiling.co.za
Referer: http://www.sarsefiling.co.za/Default.aspx
Host: www.sarsefiling.co.za
2011/02/17 20:27:02| creating entry 0x8422960: near 'Referer: http://www.sarsefiling.co.za/Default.aspx' 2011/02/17 20:27:02| created entry 0x8422960: 'Referer: http://www.sarsefiling.co.za/Default.aspx' 2011/02/17 20:27:02| creating entry 0x8422438: near 'Host: www.sarsefiling.co.za' 
2011/02/17 20:27:02| created entry 0x8422438: 'Host: www.sarsefiling.co.za'
2011/02/17 20:27:02| The request GET http://www.sarsefiling.co.za/images/HomePage/Top_Login_Roll.jpg is ALLOWED, because it matched 'localhost' 2011/02/17 20:27:02| clientRedirectStart: 'http://www.sarsefiling.co.za/images/HomePage/Top_Login_Roll.jpg' 2011/02/17 20:27:02| clientRedirectDone: 'http://www.sarsefiling.co.za/images/HomePage/Top_Login_Roll.jpg' result=NULL 2011/02/17 20:27:02| clientStoreURLRewriteStart: 'http://www.sarsefiling.co.za/images/HomePage/Top_Login_Roll.jpg' 2011/02/17 20:27:02| clientStoreURLRewriteDone: 'http://www.sarsefiling.co.za/images/HomePage/Top_Login_Roll.jpg' result=NULL 2011/02/17 20:27:02| clientProcessRequest: GET 'http://www.sarsefiling.co.za/images/HomePage/Top_Login_Roll.jpg' 2011/02/17 20:27:02| clientProcessRequest: TCP_MISS for 'http://www.sarsefiling.co.za/images/HomePage/Top_Login_Roll.jpg' 2011/02/17 20:27:02| clientProcessMiss: 'GET http://www.sarsefiling.co.za/images/HomePage/Top_Login_Roll.jpg' 2011/02/17 20:27:02| storeCreateEntry: 'http://www.sarsefiling.co.za/images/HomePage/Top_Login_Roll.jpg' 2011/02/17 20:27:02| storeKeyPrivate: GET http://www.sarsefiling.co.za/images/HomePage/Top_Login_Roll.jpg 2011/02/17 20:27:02| fwdStart: 'http://www.sarsefiling.co.za/images/HomePage/Top_Login_Roll.jpg' 2011/02/17 20:27:02| peerSelect: http://www.sarsefiling.co.za/images/HomePage/Top_Login_Roll.jpg 
2011/02/17 20:27:02| peerSelectFoo: 'GET www.sarsefiling.co.za'
2011/02/17 20:27:02| peerSelectIcpPing: http://www.sarsefiling.co.za/images/HomePage/Top_Login_Roll.jpg 
2011/02/17 20:27:02| peerGetSomeParent: GET www.sarsefiling.co.za
2011/02/17 20:27:02| peerSelectCallback: http://www.sarsefiling.co.za/images/HomePage/Top_Login_Roll.jpg 2011/02/17 20:27:02| fwdStartComplete: http://www.sarsefiling.co.za/images/HomePage/Top_Login_Roll.jpg 2011/02/17 20:27:02| fwdConnectStart: http://www.sarsefiling.co.za/images/HomePage/Top_Login_Roll.jpg 
2011/02/17 20:27:02| pconnDelete: deleting www.sarsefiling.co.za:80
2011/02/17 20:27:02| fwdDispatch: FD 12: Fetching 'GET http://www.sarsefiling.co.za/images/HomePage/Top_Login_Roll.jpg' 2011/02/17 20:27:02| httpStart: "GET http://www.sarsefiling.co.za/images/HomePage/Top_Login_Roll.jpg"; 2011/02/17 20:27:02| httpBuildRequestHeader: Referer: http://www.sarsefiling.co.za/Default.aspx 2011/02/17 20:27:02| created entry 0x8422740: 'Referer: http://www.sarsefiling.co.za/Default.aspx' 
2011/02/17 20:27:02| httpBuildRequestHeader: Host: www.sarsefiling.co.za
2011/02/17 20:27:02| created entry 0x8422540: 'Host: www.sarsefiling.co.za'
2011/02/17 20:27:02| getMaxAge: 'http://www.sarsefiling.co.za/images/HomePage/Top_Login_Roll.jpg' 2011/02/17 20:27:02| destroying entry 0x8422740: 'Referer: http://www.sarsefiling.co.za/Default.aspx' 2011/02/17 20:27:02| destroying entry 0x8422540: 'Host: www.sarsefiling.co.za' 
Referer: http://www.sarsefiling.co.za/Default.aspx
Host: www.sarsefiling.co.za
2011/02/17 20:27:02| parseHttpRequest: URI is 'http://www.sarsefiling.co.za/Default.aspx' 
Referer: http://www.sarsefiling.co.za/Default.aspx
Host: www.sarsefiling.co.za
Referer: http://www.sarsefiling.co.za/Default.aspx
Host: www.sarsefiling.co.za
Referer: http://www.sarsefiling.co.za/Default.aspx
2011/02/17 20:27:02| creating entry 0x8422160: near 'Referer: http://www.sarsefiling.co.za/Default.aspx' 2011/02/17 20:27:02| created entry 0x8422160: 'Referer: http://www.sarsefiling.co.za/Default.aspx' 2011/02/17 20:27:02| creating entry 0x8422818: near 'Host: www.sarsefiling.co.za' 
2011/02/17 20:27:02| created entry 0x8422818: 'Host: www.sarsefiling.co.za'
2011/02/17 20:27:02| The request POST http://www.sarsefiling.co.za/Default.aspx is ALLOWED, because it matched 'localhost' 2011/02/17 20:27:02| clientRedirectStart: 'http://www.sarsefiling.co.za/Default.aspx' 2011/02/17 20:27:02| clientRedirectDone: 'http://www.sarsefiling.co.za/Default.aspx' result=NULL 2011/02/17 20:27:02| clientStoreURLRewriteStart: 'http://www.sarsefiling.co.za/Default.aspx' 2011/02/17 20:27:02| clientStoreURLRewriteDone: 'http://www.sarsefiling.co.za/Default.aspx' result=NULL 2011/02/17 20:27:02| clientProcessRequest: POST 'http://www.sarsefiling.co.za/Default.aspx' 2011/02/17 20:27:02| clientProcessRequest: TCP_MISS for 'http://www.sarsefiling.co.za/Default.aspx' 2011/02/17 20:27:02| clientProcessMiss: 'POST http://www.sarsefiling.co.za/Default.aspx' 2011/02/17 20:27:02| storeCreateEntry: 'http://www.sarsefiling.co.za/Default.aspx' 2011/02/17 20:27:02| storeKeyPrivate: POST http://www.sarsefiling.co.za/Default.aspx 
2011/02/17 20:27:02| fwdStart: 'http://www.sarsefiling.co.za/Default.aspx'
2011/02/17 20:27:02| peerSelect: http://www.sarsefiling.co.za/Default.aspx
2011/02/17 20:27:02| peerSelectFoo: 'POST www.sarsefiling.co.za'
2011/02/17 20:27:02| peerSelectIcpPing: http://www.sarsefiling.co.za/Default.aspx 2011/02/17 20:27:02| peerSelectCallback: http://www.sarsefiling.co.za/Default.aspx 2011/02/17 20:27:02| fwdStartComplete: http://www.sarsefiling.co.za/Default.aspx 2011/02/17 20:27:02| fwdConnectStart: http://www.sarsefiling.co.za/Default.aspx 
2011/02/17 20:27:02| fd_open FD 17 http://www.sarsefiling.co.za/Default.aspx
2011/02/17 20:27:02| commConnectStart: FD 17, www.sarsefiling.co.za:80
2011/02/17 20:27:02| ipcache_nbgethostbyname: Name 'www.sarsefiling.co.za'.
2011/02/17 20:27:02| ipcache_nbgethostbyname: HIT for 'www.sarsefiling.co.za' 2011/02/17 20:27:02| ipcacheCycleAddr: www.sarsefiling.co.za now at 196.36.118.203 2011/02/17 20:27:02| ctx: enter level 0: 'http://www.sarsefiling.co.za/images/HomePage/Top_Login_Roll.jpg' 2011/02/17 20:27:02| clientSendHeaders: FD 12 'http://www.sarsefiling.co.za/images/HomePage/Top_Login_Roll.jpg' 2011/02/17 20:27:02| The reply for GET http://www.sarsefiling.co.za/images/HomePage/Top_Login_Roll.jpg is ALLOWED, because it matched 'all' 2011/02/17 20:27:02| storeSwapOut: http://www.sarsefiling.co.za/images/HomePage/Top_Login_Roll.jpg 2011/02/17 20:27:02| fwdUnregister: http://www.sarsefiling.co.za/images/HomePage/Top_Login_Roll.jpg 
2011/02/17 20:27:02| pconnNew: adding www.sarsefiling.co.za:80
2011/02/17 20:27:02| pconnPush: pushed FD 15 for www.sarsefiling.co.za:80
2011/02/17 20:27:02| fwdComplete: http://www.sarsefiling.co.za/images/HomePage/Top_Login_Roll.jpg 2011/02/17 20:27:02| fwdReforward: http://www.sarsefiling.co.za/images/HomePage/Top_Login_Roll.jpg? 2011/02/17 20:27:02| storeSwapOut: http://www.sarsefiling.co.za/images/HomePage/Top_Login_Roll.jpg 2011/02/17 20:27:02| httpRequestFree: http://www.sarsefiling.co.za/images/HomePage/Top_Login_Roll.jpg 2011/02/17 20:27:02| httpRequestFree: al.url='http://www.sarsefiling.co.za/images/HomePage/Top_Login_Roll.jpg' 2011/02/17 20:27:02| storeSwapOut: http://www.sarsefiling.co.za/images/HomePage/Top_Login_Roll.jpg 2011/02/17 20:27:02| ctx: enter level 0: 'http://www.sarsefiling.co.za/images/HomePage/Top_Login_Roll.jpg' 2011/02/17 20:27:02| destroying entry 0x8422960: 'Referer: http://www.sarsefiling.co.za/Default.aspx' 2011/02/17 20:27:02| destroying entry 0x8422438: 'Host: www.sarsefiling.co.za' 2011/02/17 20:27:02| fwdConnectDone: FD 17: 'http://www.sarsefiling.co.za/Default.aspx' 2011/02/17 20:27:02| fwdDispatch: FD 16: Fetching 'POST http://www.sarsefiling.co.za/Default.aspx' 2011/02/17 20:27:02| httpStart: "POST http://www.sarsefiling.co.za/Default.aspx"; 2011/02/17 20:27:02| httpBuildRequestHeader: Referer: http://www.sarsefiling.co.za/Default.aspx 2011/02/17 20:27:02| created entry 0x8405200: 'Referer: http://www.sarsefiling.co.za/Default.aspx' 
2011/02/17 20:27:02| httpBuildRequestHeader: Host: www.sarsefiling.co.za
2011/02/17 20:27:02| created entry 0x8422480: 'Host: www.sarsefiling.co.za'
2011/02/17 20:27:02| getMaxAge: 'http://www.sarsefiling.co.za/Default.aspx'
2011/02/17 20:27:02| destroying entry 0x8405200: 'Referer: http://www.sarsefiling.co.za/Default.aspx' 2011/02/17 20:27:02| destroying entry 0x8422480: 'Host: www.sarsefiling.co.za' 
Referer: http://www.sarsefiling.co.za/Default.aspx
Host: www.sarsefiling.co.za
 http://www.sarsefiling.co.za/Default.aspx
2011/02/17 20:27:08| fwdServerClosed: FD 19 http://www.sarsefiling.co.za/Default.aspx 2011/02/17 20:27:08| errorConvert: %U --> 'http://www.sarsefiling.co.za/Default.aspx' 2011/02/17 20:27:08| errorConvert: %U --> 'http://www.sarsefiling.co.za/Default.aspx' 2011/02/17 20:27:08| clientSendHeaders: FD 27 'http://www.sarsefiling.co.za/Default.aspx' 2011/02/17 20:27:08| The reply for POST http://www.sarsefiling.co.za/Default.aspx is ALLOWED, because it matched 'all' 
2011/02/17 20:27:08| storeSwapOut: http://www.sarsefiling.co.za/Default.aspx
2011/02/17 20:27:08| storeSwapOut: http://www.sarsefiling.co.za/Default.aspx
2011/02/17 20:27:08| fd_close FD 19 http://www.sarsefiling.co.za/Default.aspx 2011/02/17 20:27:08| clientSendMoreData: http://www.sarsefiling.co.za/Default.aspx, 1107 bytes 2011/02/17 20:27:08| clientSendMoreData: FD 27 'http://www.sarsefiling.co.za/Default.aspx', out.offset=214 2011/02/17 20:27:08| httpRequestFree: http://www.sarsefiling.co.za/Default.aspx 2011/02/17 20:27:08| httpRequestFree: al.url='http://www.sarsefiling.co.za/Default.aspx' 
2011/02/17 20:27:08| storeSwapOut: http://www.sarsefiling.co.za/Default.aspx
2011/02/17 20:27:08| ctx: enter level 0: 'http://www.sarsefiling.co.za/Default.aspx' 2011/02/17 20:27:08| destroying entry 0x840b5a0: 'Referer: http://www.sarsefiling.co.za/Default.aspx' 2011/02/17 20:27:08| destroying entry 0x840b3e8: 'Host: www.sarsefiling.co.za' 
 http://www.sarsefiling.co.za/Default.aspx
2011/02/17 20:27:28| fwdServerClosed: FD 24 http://www.sarsefiling.co.za/Default.aspx 2011/02/17 20:27:28| errorConvert: %U --> 'http://www.sarsefiling.co.za/Default.aspx' 2011/02/17 20:27:28| errorConvert: %U --> 'http://www.sarsefiling.co.za/Default.aspx' 2011/02/17 20:27:28| clientSendHeaders: FD 18 'http://www.sarsefiling.co.za/Default.aspx' 2011/02/17 20:27:28| The reply for POST http://www.sarsefiling.co.za/Default.aspx is ALLOWED, because it matched 'all' 
2011/02/17 20:27:28| storeSwapOut: http://www.sarsefiling.co.za/Default.aspx
2011/02/17 20:27:28| storeSwapOut: http://www.sarsefiling.co.za/Default.aspx
2011/02/17 20:27:28| fd_close FD 24 http://www.sarsefiling.co.za/Default.aspx 2011/02/17 20:27:28| clientSendMoreData: http://www.sarsefiling.co.za/Default.aspx, 1107 bytes 2011/02/17 20:27:28| clientSendMoreData: FD 18 'http://www.sarsefiling.co.za/Default.aspx', out.offset=214 2011/02/17 20:27:28| httpRequestFree: http://www.sarsefiling.co.za/Default.aspx 2011/02/17 20:27:28| httpRequestFree: al.url='http://www.sarsefiling.co.za/Default.aspx' 
2011/02/17 20:27:28| storeSwapOut: http://www.sarsefiling.co.za/Default.aspx
2011/02/17 20:27:28| ctx: enter level 0: 'http://www.sarsefiling.co.za/Default.aspx' 2011/02/17 20:27:28| destroying entry 0x8406ad8: 'Referer: http://www.sarsefiling.co.za/Default.aspx' 2011/02/17 20:27:28| destroying entry 0x840cb98: 'Host: www.sarsefiling.co.za' 
2011/02/17 20:28:02| pconnTimeout: FD 15 www.sarsefiling.co.za:80
2011/02/17 20:28:02| pconnDelete: deleting www.sarsefiling.co.za:80
2011/02/17 20:28:02| fd_close FD 15 www.sarsefiling.co.za idle connection
 http://www.sarsefiling.co.za/Default.aspx
2011/02/17 20:29:08| fwdServerClosed: FD 17 http://www.sarsefiling.co.za/Default.aspx 2011/02/17 20:29:08| errorConvert: %U --> 'http://www.sarsefiling.co.za/Default.aspx' 2011/02/17 20:29:08| errorConvert: %U --> 'http://www.sarsefiling.co.za/Default.aspx' 2011/02/17 20:29:08| clientSendHeaders: FD 16 'http://www.sarsefiling.co.za/Default.aspx' 2011/02/17 20:29:08| The reply for POST http://www.sarsefiling.co.za/Default.aspx is ALLOWED, because it matched 'all' 
2011/02/17 20:29:08| storeSwapOut: http://www.sarsefiling.co.za/Default.aspx
2011/02/17 20:29:08| storeSwapOut: http://www.sarsefiling.co.za/Default.aspx
2011/02/17 20:29:08| fd_close FD 17 http://www.sarsefiling.co.za/Default.aspx 2011/02/17 20:29:08| clientSendMoreData: http://www.sarsefiling.co.za/Default.aspx, 1107 bytes 2011/02/17 20:29:08| clientSendMoreData: FD 16 'http://www.sarsefiling.co.za/Default.aspx', out.offset=214 2011/02/17 20:29:08| httpRequestFree: http://www.sarsefiling.co.za/Default.aspx 2011/02/17 20:29:08| httpRequestFree: al.url='http://www.sarsefiling.co.za/Default.aspx' 
2011/02/17 20:29:08| storeSwapOut: http://www.sarsefiling.co.za/Default.aspx
2011/02/17 20:29:08| ctx: enter level 0: 'http://www.sarsefiling.co.za/Default.aspx' 2011/02/17 20:29:08| destroying entry 0x8422160: 'Referer: http://www.sarsefiling.co.za/Default.aspx' 2011/02/17 20:29:08| destroying entry 0x8422818: 'Host: www.sarsefiling.co.za'
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