>>> At the same time when squid reports a problem I can connect manually >>> from squid box to the same ip address (through telnet, wget, etc) and >>> nothing wrong occurs. >>> I even can belive somewhere somekind of timeout happened but how can I >>> find out what type of timeout it is? syn/ack, wait, whatever? >> It should be waiting for syn/ack. > So. Just to clarify. > From tcp point of view: squid is not able to establish connection with > origin server. Thats all. > After sending SYN packet no ACK is reponded. SYSERR=100 cannot means > that squid was able to connect but no response was returned in some > period of time. Am I right? That's what the error message seems to indicate, yes. This is not the root cause, however: it's the symptom of something else happening somewhere at the network level. -- Kinkie