Hi, Amos ! ... >ignore_expect_100 could be the reason. Exchange tries to use Expect:100-continue feature sometimes. Your browser may be timing out before it sends POST'd data. Without ignore_expect_100 we get 1331073616.344 0 207.46.14.62 NONE/417 4157 POST https://g1.xxx.de/EWS/Exchange.asmx - NONE/- text/html 1331073616.886 0 207.46.14.62 NONE/417 4157 POST https://g1.xxx.de/EWS/Exchange.asmx - NONE/- text/html 1331073659.207 0 207.46.14.62 NONE/417 4157 POST https://g1.xxx.de/EWS/Exchange.asmx - NONE/- text/html Excessive "googling" showed that it seems normal with EWS until now ;-) So as I have read it squid 3.2 will support the 1xx messages ? perhaps it gets better... Then we will have to wait for a freebsd port for 3.2 ;-) >Although that said, the above POST look to be part of an NTLM handshake and only taking 150ms. Could you rate it ? I do not know if this fast, good, slow, bad or else ;-) Regards, martin