On Mon, Sep 21, 2015 at 6:05 AM, Ángel González <keisial@xxxxxxxxx> wrote: > > New versions tend to add more key exchanges, so yes. You can also use > ssh -o KexAlgorithms=<algos use by dropbear> to test the hypothesis. > Note that this is not a definitive test because the server will still offer its full list of key exchange and cipher methods, so depending on exactly what and where the problem is, this could still potentially tickle MTU blackhole problems. You'd need to restrict the OpenSSH server's KexAlgorithms, HostKeyAlgorithms, Ciphers and Compression settings for an accurate test, and note that this configuration would be significantly less safe than OpenSSH's defaults. I'd try the MTU thing in the link I sent you. Alternatively, if you have access to both ends via some other means, find the ssh connection in the output of "netstat" on both sides and check if the SendQ column stays non-zero indicating that the network traffic never get acknowledged. $ telnet openssh 22 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. SSH-2.0-OpenSSH_7.1 SSH-2.0-me t �?�� �P6���}:� Ydiffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1'ssh-rsa,ecdsa-sha2-nistp256, ssh-ed25519lchacha20-poly1305@xxxxxxxxxxx,aes128-ctr,aes192-ctr,aes256-ctr, aes128-gcm@xxxxxxxxxxx,aes256-gcm@openssh.comlchacha20-poly1305@xxxxxxxxxxx ,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@xxxxxxxxxxx, aes256-gcm@xxxxxxxxxxx�umac-64-etm@xxxxxxxxxxx,umac-128-etm@xxxxxxxxxxx, hmac-sha2-256-etm@xxxxxxxxxxx,hmac-sha2-512-etm@xxxxxxxxxxx, hmac-sha1-etm@xxxxxxxxxxx,umac-64@xxxxxxxxxxx,umac-128@xxxxxxxxxxx ,hmac-sha2-256,hmac-sha2-512,hmac-sha1�umac-64-etm@xxxxxxxxxxx, umac-128-etm@xxxxxxxxxxx,hmac-sha2-256-etm@xxxxxxxxxxx, hmac-sha2-512-etm@xxxxxxxxxxx,hmac-sha1-etm@xxxxxxxxxxx,umac-64@xxxxxxxxxxx, umac-128@xxxxxxxxxxx,hmac-sha2-256,hmac-sha2-512,hmac-sha1 none, zlib@xxxxxxxxxxx none,zlib@xxxxxxxxxxx ^] telnet> quit Connection closed $ telnet dropear 22 Trying 192.168.34.1... Connected to rtr. Escape character is '^]'. SSH-2.0-dropbear_0.46 SSH-2.0-me �� �Hlm�O�)d��8� diffie-hellman-group1-sha1ssh-rs3des-cb3des-cbc hmac-sha1,hmac-md5 hmac-sha1,hmac-md5 none none �h8u��! ^] telnet> quit Connection closed -- Darren Tucker (dtucker at zip.com.au) GPG key 8FF4FA69 / D9A3 86E9 7EEE AF4B B2D4 37C9 C982 80C7 8FF4 FA69 Good judgement comes with experience. Unfortunately, the experience usually comes from bad judgement. _______________________________________________ openssh-unix-dev mailing list openssh-unix-dev@xxxxxxxxxxx https://lists.mindrot.org/mailman/listinfo/openssh-unix-dev