Hey all, I have a public peer system (yy.yy.yy.yy) that is reachable via my home uplink (xx.xx.xx.xxx). 15:59:30.244199 IP xx.xx.xx.xxx.42958 > yy.yy.yy.yy.https: tcp 0 15:59:30.281931 IP yy.yy.yy.yy.https > xx.xx.xx.xxx.42958: tcp 0 15:59:30.281945 IP xx.xx.xx.xxx.42958 > yy.yy.yy.yy.https: tcp 0 15:59:30.305020 IP xx.xx.xx.xxx.42958 > yy.yy.yy.yy.https: tcp 105 15:59:30.344004 IP yy.yy.yy.yy.https > xx.xx.xx.xxx.42958: tcp 1412 15:59:30.344013 IP xx.xx.xx.xxx.42958 > yy.yy.yy.yy.https: tcp 0 15:59:30.344016 IP yy.yy.yy.yy.https > xx.xx.xx.xxx.42958: tcp 23 At the office we have a EL5 based router that can not reach the mentioned system. It does not give any hint about the problem. 15:57:51.751591 IP o.ff.i.ce.50902 > yy.yy.yy.yy.https: tcp 0 15:57:54.750834 IP o.ff.i.ce.50902 > yy.yy.yy.yy.https: tcp 0 15:58:00.749351 IP o.ff.i.ce.50902 > yy.yy.yy.yy.https: tcp 0 15:58:12.746408 IP o.ff.i.ce.50902 > yy.yy.yy.yy.https: tcp 0 15:58:36.740454 IP o.ff.i.ce.50902 > yy.yy.yy.yy.https: tcp 0 15:59:24.728605 IP o.ff.i.ce.50902 > yy.yy.yy.yy.https: tcp 0 I tried to connect with a removed ecn bit [1] [1] https://en.wikipedia.org/wiki/Explicit_Congestion_Notification but this was not the solution. Any ideas? -- Thanks in advance! LF