On Thu, 2015-06-11 at 13:46 -0400, Dave Jones wrote: > Just hit this weird problem where I can ssh into a machine once, > then after logging out, subsequent ssh connections hang. > > The client side looks like.. > > 13:39:06.307781 IP wopr.kernelslacker.org.43982 > > gelk.kernelslacker.org.ssh: Flags [S], seq 319726787, win 29200, > options [mss 1460,sackOK,TS val 77408596 ecr 0,nop,wscale 7], length 0 > 13:39:06.308580 IP wopr.kernelslacker.org.43982 > > gelk.kernelslacker.org.ssh: Flags [P.], seq 319726788:319726820, ack > 1404309216, win 229, options [nop,nop,TS val 77408597 ecr 19368680], > length 32 > 13:39:06.332551 IP wopr.kernelslacker.org.43982 > > gelk.kernelslacker.org.ssh: Flags [P.], seq 32:2000, ack 33, win 229, > options [nop,nop,TS val 77408621 ecr 19368703], length 1968 > 13:39:06.370042 IP wopr.kernelslacker.org.43982 > > gelk.kernelslacker.org.ssh: Flags [P.], seq 2048:2064, ack 1265, win > 258, options [nop,nop,TS val 77408658 ecr 19368734], length 16 > 13:39:06.449511 IP wopr.kernelslacker.org.43982 > > gelk.kernelslacker.org.ssh: Flags [.], ack 1309, win 258, options > [nop,nop,TS val 77408738 ecr 19368782], length 0 > > until I ctrl-c which then sends the FIN > > 13:40:06.914614 IP wopr.kernelslacker.org.43982 > > gelk.kernelslacker.org.ssh: Flags [F.], seq 2108, ack 1309, win 258, > options [nop,nop,TS val 77469203 ecr 19368782], length 0 > > > On the sshd side.. > > > 13:39:06.311005 IP wopr.kernelslacker.org.43982 > > gelk.kernelslacker.org.ssh: Flags [S], seq 319726787, win 29200, > options [mss 1460,sackOK,TS val 77408596 ecr 0,nop,wscale 7], length 0 > 13:39:06.311254 IP wopr.kernelslacker.org.43982 > > gelk.kernelslacker.org.ssh: Flags [.], ack 1404309216, win 229, > options [nop,nop,TS val 77408596 ecr 19368680], length 0 > 13:39:06.311778 IP wopr.kernelslacker.org.43982 > > gelk.kernelslacker.org.ssh: Flags [P.], seq 0:32, ack 1, win 229, > options [nop,nop,TS val 77408597 ecr 19368680], length 32 > 13:39:06.334546 IP wopr.kernelslacker.org.43982 > > gelk.kernelslacker.org.ssh: Flags [.], ack 33, win 229, options > [nop,nop,TS val 77408619 ecr 19368703], length 0 > 13:39:06.335779 IP wopr.kernelslacker.org.43982 > > gelk.kernelslacker.org.ssh: Flags [P.], seq 32:2000, ack 33, win 229, > options [nop,nop,TS val 77408621 ecr 19368703], length 1968 > 13:39:06.347867 IP wopr.kernelslacker.org.43982 > > gelk.kernelslacker.org.ssh: Flags [P.], seq 2000:2048, ack 985, win > 243, options [nop,nop,TS val 77408633 ecr 19368711], length 48 > 13:39:06.373232 IP wopr.kernelslacker.org.43982 > > gelk.kernelslacker.org.ssh: Flags [P.], seq 2048:2064, ack 1265, win > 258, options [nop,nop,TS val 77408658 ecr 19368734], length 16 > 13:39:06.413173 IP wopr.kernelslacker.org.43982 > > gelk.kernelslacker.org.ssh: Flags [P.], seq 2064:2108, ack 1265, win > 258, options [nop,nop,TS val 77408698 ecr 19368782], length 44 > 13:39:06.452714 IP wopr.kernelslacker.org.43982 > > gelk.kernelslacker.org.ssh: Flags [.], ack 1309, win 258, options > [nop,nop,TS val 77408738 ecr 19368782], length 0 > > until the ctrl-c... > > 13:40:06.917807 IP wopr.kernelslacker.org.43982 > > gelk.kernelslacker.org.ssh: Flags [F.], seq 2108, ack 1309, win 258, > options [nop,nop,TS val 77469203 ecr 19368782], length 0 > 13:40:06.921241 IP wopr.kernelslacker.org.43982 > > gelk.kernelslacker.org.ssh: Flags [.], ack 1310, win 258, options > [nop,nop,TS val 77469206 ecr 19429290], length 0 > > > Is there anything out of the ordinary here that I'm missing, or is > this perhaps > an sshd bug ? > > The odd thing is that it seems repeatable with every host I try to ssh > to. > > 4.1rc7 on both sides, haven't tried reproducing with different kernels > yet.
Your tcpdumps look one way only. Could this be some routing or mtu problem ? -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
