My outlook sending plain txt mail is ok, while sending with attached even very small size 80KB, it's getting error 0x800CCC0F, and sending failed, If use web mail instead of outlook cleint it's success. Trying to fix it in many ways googled but no help. Other laptop connecting to same AP is working fine, till now only 3 laptops getting the issue. It's win10 and i reinstalled outlook/OS, no use. Captured the pcap at mail server side, found the server send rst,ack to client (166.78.79.129 to 172.16.2.87), before that there are many "Reassembly error" Any one can help to analyse it how it happened? Thanks in advance.
