I was unable to access a website on a webserver I frequently access. When I examined the network traffic to and from the server with Wireshark network analyzer software, I could see a repeating sequence of SYN packets from the IP address of the Windows laptop from which I was attempting to access the web server followed immediately by RST, ACK packets from the IP address of the server. That sequence repeated over and over again. E.g.:
130 2.766497 TCP 74 44970?80 [SYN] Seq=0 Win=14600 Len=0 MSS=1460 SACK_PERM=1 TSval=1029178963 TSecr=0 WS=16 131 2.768022 TCP 60 80?44970 [RST, ACK] Seq=1 Ack=1 Win=0 Len=0 132 2.800200 TCP 74 27779?80 [SYN] Seq=0 Win=14600 Len=0 MSS=1460 SACK_PERM=1 TSval=1029178972 TSecr=0 WS=16 133 2.801724 TCP 60 80?27779 [RST, ACK] Seq=1 Ack=1 Win=0 Len=0
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