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Fri, Jan 06, 2017 8:44 pm

Wireshark showing RST packets when unable to access website

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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