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.
1 Reply
Hi,
I too see this problem. It big problem 50% traffic loses because this. Error on page Paris, Warsaw and Frankfurt....
But I see this on traceroute. Yesterday big loss, at this night problem was solved, but in the morning there are big losses again and problem still persist
traceroute 172.68.138.122 -n
traceroute to 172.68.138.122 (172.68.138.122), 30 hops max, 60 byte packets
1 45.135.92.1 0.489 ms 0.476 ms 0.450 ms
2 93.189.144.136 0.242 ms 0.256 ms 0.248 ms
3 80.64.102.112 0.460 ms 0.455 ms 0.433 ms
4 80.64.97.71 1.446 ms 1.174 ms 1.441 ms
5 80.64.97.70 1.008 ms 1.039 ms 1.023 ms
6 * 172.68.138.122 28.493 ms *
traceroute 162.158.102.12 -n
traceroute to 162.158.102.12 (162.158.102.12), 30 hops max, 60 byte packets
1 45.135.92.1 1.512 ms 1.704 ms 1.683 ms
2 93.189.144.136 0.407 ms 0.432 ms 0.423 ms
3 80.64.102.112 0.413 ms 0.402 ms 0.380 ms
4 80.64.97.71 0.995 ms 1.226 ms 1.226 ms
5 80.64.97.70 1.186 ms 0.707 ms 0.729 ms
6 * * *
7 162.158.102.12 28.667 ms 28.437 ms 28.458 ms