Hello! ssh -X and ssh -Y both failing:
from an Apple Air running High Sierra 10.13.6, host air2 to iMac running Catalina 10.15.4, host ecd-imac27 All worked fine until latest upgrade of Catalina. Both running XQuartz 2.7.11. Now it fails as follows: air2: ssh -X ecd-imac27.local X11 forwarding request failed on channel 0 Last login: Tue Apr 28 16:20:02 2020 from fe80::873:528c:d42b:c768%en1 ecd-imac27: Note I can still create a tunnel connection manually on :1 just fine: air2: ssh -R 6001:127.0.0.1:6000 ecd-imac27.local Last login: Tue Apr 28 16:21:20 2020 from 192.168.7.112 ecd-imac27: setenv DISPLAY :1 ecd-imac27: xeyes *displays correctly on air2* Any idea what happened? I've pasted output from "ssh -v" below in case it helps. Many thanks, Elwood Downey, Tucson AZ air2: ssh -v -X ecd-imac27.local OpenSSH_7.8p1, LibreSSL 2.6.2 debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 48: Applying options for * debug1: /etc/ssh/ssh_config line 52: Applying options for * debug1: Connecting to ecd-imac27.local port 22. debug1: Connection established. debug1: identity file /Users/ecdowney/.ssh/id_rsa type 0 debug1: identity file /Users/ecdowney/.ssh/id_rsa-cert type -1 debug1: identity file /Users/ecdowney/.ssh/id_dsa type -1 debug1: identity file /Users/ecdowney/.ssh/id_dsa-cert type -1 debug1: identity file /Users/ecdowney/.ssh/id_ecdsa type -1 debug1: identity file /Users/ecdowney/.ssh/id_ecdsa-cert type -1 debug1: identity file /Users/ecdowney/.ssh/id_ed25519 type -1 debug1: identity file /Users/ecdowney/.ssh/id_ed25519-cert type -1 debug1: identity file /Users/ecdowney/.ssh/id_xmss type -1 debug1: identity file /Users/ecdowney/.ssh/id_xmss-cert type -1 debug1: Local version string SSH-2.0-OpenSSH_7.8 debug1: Remote protocol version 2.0, remote software version OpenSSH_8.1 debug1: match: OpenSSH_8.1 pat OpenSSH* compat 0x04000000 debug1: Authenticating to ecd-imac27.local:22 as 'ecdowney' debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: algorithm: curve25519-sha256 debug1: kex: host key algorithm: ecdsa-sha2-nistp256 debug1: kex: server->client cipher: [email protected] MAC: <implicit> compression: none debug1: kex: client->server cipher: [email protected] MAC: <implicit> compression: none debug1: expecting SSH2_MSG_KEX_ECDH_REPLY debug1: Server host key: ecdsa-sha2-nistp256 SHA256:mt3hyg1EnYyy2azoagAjIZNXeuC+PVYjNXTG1I+nCOc debug1: Host 'ecd-imac27.local' is known and matches the ECDSA host key. debug1: Found key in /Users/ecdowney/.ssh/known_hosts:49 debug1: rekey after 134217728 blocks debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: rekey after 134217728 blocks debug1: SSH2_MSG_EXT_INFO received debug1: kex_input_ext_info: server-sig-algs=<ssh-ed25519,ssh-rsa,rsa-sha2-256,rsa-sha2-512,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521> debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey,password,keyboard-interactive debug1: Next authentication method: publickey debug1: Offering public key: RSA SHA256:uP9zayX/QNMPYWtD/d/35DdKuF7qBUDX9CyqQnCmiTQ /Users/ecdowney/.ssh/id_rsa debug1: Server accepts key: pkalg rsa-sha2-512 blen 279 debug1: Authentication succeeded (publickey). Authenticated to ecd-imac27.local ([fe80::83b:4089:52ba:8046%en0]:22). debug1: channel 0: new [client-session] debug1: Requesting [email protected] debug1: Entering interactive session. debug1: pledge: exec debug1: client_input_global_request: rtype [email protected] want_reply 0 debug1: Remote: /Users/ecdowney/.ssh/authorized_keys:11: key options: agent-forwarding port-forwarding pty user-rc x11-forwarding debug1: Remote: /Users/ecdowney/.ssh/authorized_keys:11: key options: agent-forwarding port-forwarding pty user-rc x11-forwarding debug1: Requesting X11 forwarding with authentication spoofing. debug1: Sending environment. debug1: Sending env LANG = en_US debug1: Sending env LC_ALL = C X11 forwarding request failed on channel 0 Last login: Tue Apr 28 16:19:54 2020 from 192.168.7.112 ecd-imac27: logout -- Elwood Downey Scientific Programmer
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