Thanks to both of you!

Dima, unfortunately, I still have the issue. I checked the permissions, they
seem okay: `-rw-r--r--` for the public key and `-rw-------` for the private one.
My other working pairs of keys have exactly the same privileges.

Attached to this message is the log (3 levels) of `ssh -vvv -i ~/.ssh/ssh_key-
sage-trac-2 g...@trac.sagemath.org info`, maybe this can help. Let me know if I
can do anything.

Antoine

On Thu, 2022-04-07 at 17:27 +0100, Dima Pasechnik wrote:
> I'll reboot trac now, see if it helps.
> Also, check that your keys have correct permissions.
> 
> On Thu, Apr 7, 2022 at 5:08 PM Maxime Bombar <maxime.bom...@inria.fr> wrote:
> > 
> > On 4/7/22 17:59, Antoine Leudière wrote:
> > > Hi Maxime,
> > > 
> > > Thanks a lot for answering! I did, yes --- but I may very well be missing
> > > something!
> > > 
> > > However, I tried to add / remove trailing spaces or blank lines at the 
> > > end;
> > > or
> > > to modify the comment, but nothing seemed to work... I also tried with a
> > > standard RSA key. And, a colleague of mine created a Trac account 
> > > especially
> > > to
> > > try this out, and had the same error.
> > > 
> > > A.
> > > 
> > > P.-S. : I apologize to the mod-team as I realize that I may have submitted
> > > my
> > > issue twice.
> > > 
> > very weird indeed ...
> > 
> > Maybe there is a delay I can't remember when I registered my ssh key.
> > 
> > But indeed I tried to register a new one and I can reproduce your error.
> > 
> > I don't think there is an issue with your key though, comments should
> > not interfere whatsoever.
> > 
> > --
> > Maxime
> > 
> > --
> > You received this message because you are subscribed to the Google Groups
> > "sage-devel" group.
> > To unsubscribe from this group and stop receiving emails from it, send an
> > email to sage-devel+unsubscr...@googlegroups.com.
> > To view this discussion on the web visit
> > https://groups.google.com/d/msgid/sage-devel/a70b2780-02b3-7ceb-11b3-310713b1095b%40inria.fr
> > .
> 

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OpenSSH_8.4p1 Ubuntu-6ubuntu2.1, OpenSSL 1.1.1l  24 Aug 2021
debug1: Reading configuration data MYHOME_REDACTED/.ssh/config
debug1: MYHOME_REDACTED/.ssh/config line 3: Applying options for *
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: include /etc/ssh/ssh_config.d/*.conf 
matched no files
debug1: /etc/ssh/ssh_config line 21: Applying options for *
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts' -> 
'MYHOME_REDACTED/.ssh/known_hosts'
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts2' -> 
'MYHOME_REDACTED/.ssh/known_hosts2'
debug2: resolving "trac.sagemath.org" port 22
debug2: ssh_connect_direct
debug1: Connecting to trac.sagemath.org [104.197.143.230] port 22.
debug1: Connection established.
debug1: identity file MYHOME_REDACTED/.ssh/ssh_key-sage-trac-2 type 3
debug1: identity file MYHOME_REDACTED/.ssh/ssh_key-sage-trac-2-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_8.4p1 Ubuntu-6ubuntu2.1
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.6.1p1 
Ubuntu-2ubuntu2.13
debug1: match: OpenSSH_6.6.1p1 Ubuntu-2ubuntu2.13 pat OpenSSH_6.6.1* compat 
0x04000002
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to trac.sagemath.org:22 as 'git'
debug3: hostkeys_foreach: reading file "MYHOME_REDACTED/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file 
MYHOME_REDACTED/.ssh/known_hosts:34
debug3: load_hostkeys: loaded 1 keys from trac.sagemath.org
debug3: order_hostkeyalgs: have matching best-preference key type 
ecdsa-sha2-nistp256-cert-...@openssh.com, using HostkeyAlgorithms verbatim
debug3: send packet: type 20
debug1: SSH2_MSG_KEXINIT sent
debug3: receive packet: type 20
debug1: SSH2_MSG_KEXINIT received
debug2: local client KEXINIT proposal
debug2: KEX algorithms: 
curve25519-sha256,curve25519-sha...@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,ext-info-c
debug2: host key algorithms: 
ecdsa-sha2-nistp256-cert-...@openssh.com,ecdsa-sha2-nistp384-cert-...@openssh.com,ecdsa-sha2-nistp521-cert-...@openssh.com,sk-ecdsa-sha2-nistp256-cert-...@openssh.com,ssh-ed25519-cert-...@openssh.com,sk-ssh-ed25519-cert-...@openssh.com,rsa-sha2-512-cert-...@openssh.com,rsa-sha2-256-cert-...@openssh.com,ssh-rsa-cert-...@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ecdsa-sha2-nistp...@openssh.com,ssh-ed25519,sk-ssh-ed25...@openssh.com,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos: 
chacha20-poly1...@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-...@openssh.com,aes256-...@openssh.com
debug2: ciphers stoc: 
chacha20-poly1...@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-...@openssh.com,aes256-...@openssh.com
debug2: MACs ctos: 
umac-64-...@openssh.com,umac-128-...@openssh.com,hmac-sha2-256-...@openssh.com,hmac-sha2-512-...@openssh.com,hmac-sha1-...@openssh.com,umac...@openssh.com,umac-...@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: 
umac-64-...@openssh.com,umac-128-...@openssh.com,hmac-sha2-256-...@openssh.com,hmac-sha2-512-...@openssh.com,hmac-sha1-...@openssh.com,umac...@openssh.com,umac-...@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,z...@openssh.com,zlib
debug2: compression stoc: none,z...@openssh.com,zlib
debug2: languages ctos: 
debug2: languages stoc: 
debug2: first_kex_follows 0 
debug2: reserved 0 
debug2: peer server KEXINIT proposal
debug2: KEX algorithms: 
curve25519-sha...@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: host key algorithms: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256
debug2: ciphers ctos: 
aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-...@openssh.com,aes256-...@openssh.com,chacha20-poly1...@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-...@lysator.liu.se
debug2: ciphers stoc: 
aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-...@openssh.com,aes256-...@openssh.com,chacha20-poly1...@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-...@lysator.liu.se
debug2: MACs ctos: 
hmac-md5-...@openssh.com,hmac-sha1-...@openssh.com,umac-64-...@openssh.com,umac-128-...@openssh.com,hmac-sha2-256-...@openssh.com,hmac-sha2-512-...@openssh.com,hmac-ripemd160-...@openssh.com,hmac-sha1-96-...@openssh.com,hmac-md5-96-...@openssh.com,hmac-md5,hmac-sha1,umac...@openssh.com,umac-...@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd...@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: MACs stoc: 
hmac-md5-...@openssh.com,hmac-sha1-...@openssh.com,umac-64-...@openssh.com,umac-128-...@openssh.com,hmac-sha2-256-...@openssh.com,hmac-sha2-512-...@openssh.com,hmac-ripemd160-...@openssh.com,hmac-sha1-96-...@openssh.com,hmac-md5-96-...@openssh.com,hmac-md5,hmac-sha1,umac...@openssh.com,umac-...@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd...@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: compression ctos: none,z...@openssh.com
debug2: compression stoc: none,z...@openssh.com
debug2: languages ctos: 
debug2: languages stoc: 
debug2: first_kex_follows 0 
debug2: reserved 0 
debug1: kex: algorithm: curve25519-sha...@libssh.org
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: chacha20-poly1...@openssh.com MAC: 
<implicit> compression: none
debug1: kex: client->server cipher: chacha20-poly1...@openssh.com MAC: 
<implicit> compression: none
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug3: receive packet: type 31
debug1: Server host key: ecdsa-sha2-nistp256 
SHA256:4Op/q3b5792x+F1lHSKRi5UIORAPDlIFVA5cUq9YVXI
debug3: hostkeys_foreach: reading file "MYHOME_REDACTED/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file 
MYHOME_REDACTED/.ssh/known_hosts:34
debug3: load_hostkeys: loaded 1 keys from trac.sagemath.org
debug3: hostkeys_foreach: reading file "MYHOME_REDACTED/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file 
MYHOME_REDACTED/.ssh/known_hosts:33
debug3: load_hostkeys: loaded 1 keys from IP_REDACTED
debug1: Host 'trac.sagemath.org' is known and matches the ECDSA host key.
debug1: Found key in MYHOME_REDACTED/.ssh/known_hosts:34
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey out after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: receive packet: type 21
debug1: SSH2_MSG_NEWKEYS received
debug2: set_newkeys: mode 0
debug1: rekey in after 134217728 blocks
debug1: Will attempt key: MYHOME_REDACTED/.ssh/ssh_key-sage-trac-2 ED25519 
SHA256:MYHASH_REDACTED explicit agent
debug2: pubkey_prepare: done
debug3: send packet: type 5
debug3: receive packet: type 6
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug3: send packet: type 50
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey
debug3: start over, passed a different list publickey
debug3: preferred gssapi-with-mic,publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Offering public key: MYHOME_REDACTED/.ssh/ssh_key-sage-trac-2 ED25519 
SHA256:MYHASH_REDACTED explicit agent
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey
debug2: we did not send a packet, disable method
debug1: No more authentication methods to try.
g...@trac.sagemath.org: Permission denied (publickey).

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