Re: Synchronization issues of debian.cs.nycu.edu.tw
Shao-Fu Chen <[email protected]> Fri, 6 Oct 2023 21:26:24 +0800
| Newsgroups | gmane.linux.debian.user.mirrors |
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| Message-ID | <[email protected]> |
This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------iKCq4E0zCdjp330g6ikF0jOi Content-Type: multipart/mixed; boundary="------------gpFLLL0Mo76kVb17bRQhvab6"; protected-headers="v1" From: Shao-Fu Chen <[email protected]> To: "Adam D. Barratt" <[email protected]>, [email protected] Cc: [email protected] Message-ID: <[email protected]> Subject: Re: Synchronization issues of debian.cs.nycu.edu.tw References: <[email protected]> <9038686408beddee7bfa55ca1cd3a5cadf8540a0.camel@adam-barratt.org.uk> <[email protected]> <f7fab3b01d466e30289990b67c5d4e29145d26f5.camel@adam-barratt.org.uk> <fbe72218bf43ef7acae6f5d67938efecd7c71933.camel@adam-barratt.org.uk> <[email protected]> <f453ab2342d2e6a8cfe4bd2c6d52febdf9824835.camel@adam-barratt.org.uk> <[email protected]> <fb3be9b2e1831030e962bfd076e90d89e0c00c40.camel@adam-barratt.org.uk> In-Reply-To: <fb3be9b2e1831030e962bfd076e90d89e0c00c40.camel@adam-barratt.org.uk> --------------gpFLLL0Mo76kVb17bRQhvab6 Content-Type: multipart/mixed; boundary="------------Ke0K3Y3BTNrraZJtNuqBncad" --------------Ke0K3Y3BTNrraZJtNuqBncad Content-Type: multipart/alternative; boundary="------------3VGhdq4Yv8k5Md6t8C9nX0Se" --------------3VGhdq4Yv8k5Md6t8C9nX0Se Content-Type: text/plain; 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Content-Transfer-Encoding: quoted-printable <!DOCTYPE html> <html> <head> <meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DUTF= -8"> </head> <body> <p>Hi,</p> <p>If the connection is blocked from our server's firewall, you should get an ICMP admin prohibited reply.<br> I am not sure whether the timeouts are network issues or being blocked by the firewall of<span> Taiwan Academic Network.<br> I am sorry that I am not able to provide much help for the two cases.<br> </span></p> <div class=3D"moz-signature"> <p> Best regards,<br> <strong>=E9=99=B3=E5=B0=91=E7=94=AB</strong> / Shao-Fu Chen (<str= ong>shfchen</strong>)<br> =E5=8A=A9=E6=95=99 / Teach Assistant<br> =E5=9C=8B=E7=AB=8B=E9=99=BD=E6=98=8E=E4=BA=A4=E9=80=9A=E5=A4=A7=E5= =AD=B8 =E8=B3=87=E8=A8=8A=E5=B7=A5=E7=A8=8B=E5=AD=B8=E7=B3=BB=E8=B3=87=E8= =A8=8A=E4=B8=AD=E5=BF=83 (<a href=3D"https://it.cs.nycu.edu.tw/" target=3D"_blank">NYCU CS IT Center</a>)<br> Information Technology Center,<br> Department of Computer Science,<br> National Yang Ming Chiao Tung University<br> </p> </div> <div class=3D"moz-cite-prefix">Adam D. Barratt =E6=96=BC 2023/10/5 04= :55 =E5=AF=AB=E9=81=93:<br> </div> <blockquote type=3D"cite" cite=3D"mid:[email protected]= rg.uk"> <pre class=3D"moz-quote-pre" wrap=3D"">Hi, Oops, sorry, yes, that's my fault for not picking the correct source address when testing. Sadly, that doesn't get us any further with the original issue. The SSH configuration for the push is definitely using .217, and the errors we're seeing are timeouts rather than connection resets. Regards, Adam On Thu, 2023-10-05 at 04:48 +0800, Shao-Fu Chen wrote: </pre> <blockquote type=3D"cite"> <pre class=3D"moz-quote-pre" wrap=3D"">Hi,=20 I found that the source IP in your tcpdump is 140.211.166.200, which is not the configured whitelisted IP "140.211.166.217" to access our server's SSH port. Therefore, the traffic is blocked from the firewall. I don't know whether the outgoing IP from the syncing server would be different base on different circumstances. If that is true, adding other IP addresses may solve this issues. Best regards, =E9=99=B3=E5=B0=91=E7=94=AB / Shao-Fu Chen (shfchen) =E5=8A=A9=E6=95=99 / Teach Assistant =E5=9C=8B=E7=AB=8B=E9=99=BD=E6=98=8E=E4=BA=A4=E9=80=9A=E5=A4=A7=E5=AD=B8 = =E8=B3=87=E8=A8=8A=E5=B7=A5=E7=A8=8B=E5=AD=B8=E7=B3=BB=E8=B3=87=E8=A8=8A=E4= =B8=AD=E5=BF=83 (NYCU CS IT Center) Information Technology Center, Department of Computer Science, National Yang Ming Chiao Tung University Adam D. Barratt =E6=96=BC 2023/10/5 01:01 =E5=AF=AB=E9=81=93: </pre> <blockquote type=3D"cite"> <pre class=3D"moz-quote-pre" wrap=3D"">Hi, I'm also not sure why it would fail, but it definitely does seem like something is filtering the traffic at a packet inspection level. I've run some traffic dumps while attempting connections in various ways. Running "ssh" with the wrong username results in a "permission denied" error, as would be expected, and a small amount of traffic. Using a non-protocol-aware tool such as telnet or "nc" results in: 16:49:22.206649 enP2p1s0f0 Out IP 140.211.166.200.43766 > 140.113.17.5.22: Flags [S], seq 475671543, win 64240, options [mss 1460,sackOK,TS val 4134193521 ecr 0,nop,wscale 7], length 0 0x0000: 4510 003c 3500 4000 4006 349a 8cd3 a6c8 E..<a class=3D"moz-txt-link-rfc2396E" href=3D"mailto:5.@[email protected]= 0010:8c711105aaf600161c5a2bf700000000.q.......Z+.....0x0020:a002faf0d1400= [email protected]:f66ac9710000000001030307.j.q...= =2E....16:49:22.366820enP2p1s0f0PIP140.113.17.5"><5.@[email protected]..... 0x0010: 8c71 1105 aaf6 0016 1c5a 2bf7 0000 0000 .q.......Z+..... 0x0020: a002 faf0 d140 0000 0204 05b4 0402 080a .....@.......... 0x0030: f66a c971 0000 0000 0103 0307 .j.q........ 16:49:22.366820 enP2p1s0f0 P IP 140.113.17.5 ></a> 140.211.166.200: ICMP host 140.113.17.5 unreachable - admin prohibited, length 68 0x0000: 45c0 0058 3afa 0000 3001 7dd9 8c71 1105 E..X:...0.}..q.. 0x0010: 8cd3 a6c8 030a ce36 0000 0000 4500 003c .......6....E..< 0x0020: 3500 4000 3106 43aa 8cd3 a6c8 8c71 1105 <a class=3D"moz-txt-link-abbreviated" href=3D"mailto:[email protected]= ">[email protected]</a>.. 0x0030: aaf6 0016 1c5a 2bf7 0000 0000 a002 faf0 .....Z+......... 0x0040: c8c2 0000 0204 05b4 0402 080a f66a c971 .............j.q 0x0050: 0000 0000 0103 0307 ........ Regards, Adam On Tue, 2023-10-03 at 18:07 +0800, Shao-Fu Chen wrote: </pre> <blockquote type=3D"cite"> <pre class=3D"moz-quote-pre" wrap=3D"">Hello, I can find two successful login attempts on our server: [shfchen@linux ~]$ sudo cat /var/log/secure | grep 140.211.166.217 Oct 3 00:17:04 linux sshd[10238]: Accepted publickey for debi_adm from 140.211.166.217 port 56915 ssh2: RSA SHA256:VzG9tNbWoaaqqsjrW9e6NzlhgIcwz8ZlVkc76fR1q2Y Oct 3 02:15:44 linux sshd[10241]: Received disconnect from 140.211.166.217 port 56915:11: disconnected by user Oct 3 02:15:44 linux sshd[10241]: Disconnected from 140.211.166.217 port 56915 Oct 3 16:29:54 linux sshd[22419]: Accepted publickey for debi_adm from 140.211.166.217 port 42715 ssh2: RSA SHA256:VzG9tNbWoaaqqsjrW9e6NzlhgIcwz8ZlVkc76fR1q2Y P.s. The log timestamp is UTC+8. I have no idea why the push attempt would failed. Best regards, =E9=99=B3=E5=B0=91=E7=94=AB / Shao-Fu Chen (shfchen) =E5=8A=A9=E6=95=99 / Teach Assistant =E5=9C=8B=E7=AB=8B=E9=99=BD=E6=98=8E=E4=BA=A4=E9=80=9A=E5=A4=A7=E5=AD=B8 = =E8=B3=87=E8=A8=8A=E5=B7=A5=E7=A8=8B=E5=AD=B8=E7=B3=BB=E8=B3=87=E8=A8=8A=E4= =B8=AD=E5=BF=83 (NYCU CS IT Center) Information Technology Center, Department of Computer Science, National Yang Ming Chiao Tung University Adam D. Barratt =E6=96=BC 2023/10/3 16:47 =E5=AF=AB=E9=81=93: </pre> <blockquote type=3D"cite"> <pre class=3D"moz-quote-pre" wrap=3D"">On Tue, 2023-10-03 a= t 07:02 +0100, Adam D. Barratt wrote: </pre> <blockquote type=3D"cite"> <pre class=3D"moz-quote-pre" wrap=3D"">On Mon, 2023-10-02= at 21:24 +0800, Shao-Fu Chen wrote: </pre> <blockquote type=3D"cite"> <pre class=3D"moz-quote-pre" wrap=3D"">Hello, We have already updated the firewall configuration to accept the two IP addresses and sent a response mail back then.=20 However, it is sorry that we didn't notice the response mail had been bounced back due to the wrong configurations on our mail service. I can confirm that 140.211.166.217 can successfully trigger pushes before September 22nd. If everything is OK, please re- enable pushes. </pre> </blockquote> <pre class=3D"moz-quote-pre" wrap=3D""> Thanks for confirming. I've re-enabled pushes. </pre> </blockquote> <pre class=3D"moz-quote-pre" wrap=3D""> The first automated push attempt failed: =3D=3D=3D bash: warning: setlocale: LC_ALL: cannot change locale (C.UTF- 8) /bin/sh: warning: setlocale: LC_ALL: cannot change locale (C.UTF-8) bash: warning: setlocale: LC_ALL: cannot change locale (C.UTF- 8) Timeout, server debian.cs.nctu.edu.tw not responding. =3D=3D=3D Manual attempts to connect to the server also fail currently, but worked yesterday evening: adsb@mirror-osuosl:~$ nc -v debian.cs.nctu.edu.tw 22 nc: connect to debian.cs.nctu.edu.tw (140.113.17.5) port 22 (tcp) failed: No route to host An MTR from the same host looks fine. Is it being filtered on your side somewhere? Regards, Adam </pre> </blockquote> </blockquote> </blockquote> </blockquote> <pre class=3D"moz-quote-pre" wrap=3D""> </pre> </blockquote> </body> </html> --------------3VGhdq4Yv8k5Md6t8C9nX0Se-- --------------Ke0K3Y3BTNrraZJtNuqBncad Content-Type: application/pgp-keys; name="OpenPGP_0xD7113DB145945352.asc" Content-Disposition: attachment; filename="OpenPGP_0xD7113DB145945352.asc" Content-Description: OpenPGP public key Content-Transfer-Encoding: quoted-printable -----BEGIN PGP PUBLIC KEY BLOCK----- xsFNBGBu3OEBEACtEGe4UyPZXUWoKWVR9BQfv/Tnh/7WKpmwa9yqSd1hWRh6Ajtv glGxCAwXYc/kEgVC6I30qOVg0TOKr9fGJ2XDYlaCci1ZbMqDL3kTSyK4hZcbRYzv 6bah6RxFJjuMVYwJ/NYJ3Rg9wRw9YGTlfY2vlAhsvaTV1MfGOZ66hPlY/AT2P8Az BAe3Ll+FbT/5GL/pAQyxIFjE6SS009jsAH+hU0ZOkyzjkzEcE+MUyJsbO52qoXhk hooF1/rlw63NR0MBM4d1+YfPZu17J9C0AqFbXTk6wz/uUV8Vgo520m7cxe3LPQsG DmNxQ7ecvZYCUfzFTyv+o9TqYYvsmgl9zYpgBoAmIpy97Ty9kVFkyh/2BpcicX2T lgdFHUyMz/TUz2HICC5H6gY/VnQF3th/pXLAgY/1RRHPyGVayRxpX/9H8Tz2+afX 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