Random TCP handshake problems / HTTP 522
Hi,
Since Friday we're experiencing random 522 at customers' pages. I've found that some CF servers doesn't want to talk with us when they get SYN-ACK send from synproxy, it seems like the SYN-ACK is rejected somewhere. I see that in DCs located in Warsaw and Frankfurt. When I pass traffic form CF beyond the synproxy everything is ok. It's not a subject of specific prefix or address. One address generally works, but once upon a time it doesn't establish TCP session for a few minutes. MTRs doesn't show any packet loss. tcpdump and traceroute outputs attached.
Since Friday we're experiencing random 522 at customers' pages. I've found that some CF servers doesn't want to talk with us when they get SYN-ACK send from synproxy, it seems like the SYN-ACK is rejected somewhere. I see that in DCs located in Warsaw and Frankfurt. When I pass traffic form CF beyond the synproxy everything is ok. It's not a subject of specific prefix or address. One address generally works, but once upon a time it doesn't establish TCP session for a few minutes. MTRs doesn't show any packet loss. tcpdump and traceroute outputs attached.
cf.txt5.36KB
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