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A comment on TCP Connection Timeout Mystery.

Re:TCP Connection Timeout Mystery by krypd0h on Monday March 25, 2024 @02:39PM (#39819818)
I wouldn't be surprised if someone (your Uni) is mistakenly blocking some 169.x.x.x data since 169.254.0.0/16 is used for local IPs. Someone put the wrong subnet mask in a firewall rule or ACL someplace.
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Re:TCP Connection Timeout Mystery by vadiml on Monday March 25, 2024 @04:37PM (#39821003)
This would prevent initial SYN To reach the server too.
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Re:TCP Connection Timeout Mystery by Hikikomori on Monday March 25, 2024 @07:24PM (#39822445)
Not if you match on outbound established connections, then the syn and syn/ack would be allowed, but the ack to complete the handshake would be dropped.
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Re:TCP Connection Timeout Mystery by Hikikomori on Monday March 25, 2024 @09:13PM (#39823272)
Not if you also match on established connections and outbound only.
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