tug.ctan.org inaccessible on a specific machine

AC achirvasub at gmail.com
Fri Apr 2 13:50:22 CEST 2021


Thanks for that suggestion (to both of you who've made it)!

https://www.abuseipdb.com/

says the IP in question has *not* been reported, so I'm good there.

https://www.ipvoid.com/ip-blacklist-check/

and

https://www.whatismyip.com/blacklist-check/

lists that external IP as completely safe, meaning it's not on any of the blacklists they check (dozens, maybe over 100 in each case).

On the other hand,

https://whatismyip.live/blacklist-check

finds it on some uribl.com lists, but that's not it either: my home address is on there too (for unfathomable reasons), and I can ping tug.ctan.org fine from there.

In fact, trying out a bunch of these websites, my home external IP tends to be on more blacklists than the problematic one..

On April 2, 2021 7:46:03 AM EDT, Henri Menke via tex-live <tex-live at tug.org> wrote:
>Ah, you're on a DigitalOcean VPS. They are very popular among scammers,
>spammers, and for DDoS, so it's very likely that your IP is blocked
>pretty much everywhere. Check whether you appear in any of the common
>databases, e.g.
>
>https://www.abuseipdb.com
>
>Cheers, Henri
>
>On Fri, 2021-04-02 at 07:09 -0400, AC wrote:
>> Here are the results of an mtr ping:
>> 
>> Start: 2021-04-02T03:33:06+0000
>> HOST:
>> gilead                                                               
>>  Loss%   Snt   Last   Avg  Best  Wrst StDev
>>   1.
>> AS???    ???                                                         
>>   100.0   100    0.0   0.0   0.0   0.0   0.0
>>   2.
>> AS???    10.74.132.77                                                
>>    0.0%   100    0.5   0.9   0.4  29.9   3.0
>>   3.
>> AS???    138.197.248.232                                             
>>    0.0%   100    1.1   2.3   0.7  36.6   4.9
>>   4.
>> AS???    138.197.248.12                                              
>>    0.0%   100    0.6   1.8   0.3  61.5   7.4
>>   5.
>> AS???    138.197.244.46                                              
>>    0.0%   100    0.9   1.1   0.8   4.4   0.5
>>   6.
>> AS14061  162.243.191.247                                             
>>    0.0%   100    0.9   1.5   0.9  36.5   3.7
>>   7. AS6461   ae18.cs1.lga5.us.zip.zayo.com
>> (64.125.27.178)                 99.0%   100   48.4  48.4  48.4  48.4 
>>   0.0
>>   8. AS6461   ae3.cs3.ord2.us.eth.zayo.com
>> (64.125.29.209)                  88.0%   100   50.9  49.1  48.4  50.9
>>    0.7
>>   9.
>> AS???    ???                                                         
>>   100.0   100    0.0   0.0   0.0   0.0   0.0
>>  10. AS6461   ae11.mpr2.slc2.us.zip.zayo.com
>> (64.125.26.43)                  0.0%   100   48.3  49.1  48.1  75.9  
>>  3.5
>>  11. AS6461   ae4.mpr1.slc2.us.zip.zayo.com
>> (64.125.26.164)                  0.0%   100   47.6  48.4  47.6  65.2 
>>   2.3
>>  12. AS6461   209.66.120.134.IPYX-246177-ZYO.zip.zayo.com
>> (209.66.120.134)   0.0%   100   48.3  49.1  48.2  65.4   3.1
>>  13.
>> AS210    140.197.253.110                                             
>>    0.0%   100   49.5  49.6  49.4  50.1   0.1
>>  14.
>> AS210    140.197.252.76                                              
>>    0.0%   100   49.7  49.6  49.3  50.1   0.1
>>  15.
>> AS210    140.197.252.84                                              
>>    0.0%   100   50.9  49.7  49.3  52.0   0.5
>>  16.
>> AS210    140.197.253.139                                             
>>    0.0%   100   49.4  49.3  49.2  50.1   0.1
>>  17.
>> AS17055  199.104.93.117                                              
>>    0.0%   100   49.6  49.6  49.5  50.2   0.1
>>  18.
>> AS17055  199.104.93.102                                              
>>    0.0%   100   50.1  50.7  50.0  63.7   1.9
>>  19.
>> AS17055  155.99.130.59                                               
>>    0.0%   100   50.2  50.1  50.0  50.7   0.1
>>  20.
>> AS17055  155.99.130.14                                               
>>    0.0%   100   50.4  50.4  49.9  62.9   1.7
>>  21.
>> AS???    ???                                                         
>>   100.0   100    0.0   0.0   0.0   0.0   0.0
>> 
>> ---
>> 
>> I am certainly *not* on ip6, and my VPS admins advise as follows:
>> 
>> > Thank you for following up and sharing the mtr results. As per the
>> > mtr results, the destination domain "tug.ctan.org" is not
>> > reachable. As we are able to ping from other droplets, I suspect
>> > the issue is that your droplet's IP address is blocked at the
>> > destination.
>> > 
>> > As the packets are moving out of DigitalOcean' network (AS14061)
>> > and traversing to the destination, this isn't an issue at the
>> > DigitalOcean managed network. You will need to contact the
>> > administrator of the domain "tug.ctan.org" and request them to
>> > check if the droplet's IP is blacklisted for some reason and
>> > request them to delist.
>> > 
>> 
>> This is what it looks like to me too: there's every indication that
>> tug.ctan.org is specifically blocking this IP. I simply do not see
>> how the issue could be at my end..
>> 
>> Whom would I contact about that? 
>> 
>> I am not sure who controls tug.ctan.org, and whether someone who
>> could un-blacklist me is reading this.
>> 
>> On April 2, 2021 6:56:13 AM EDT, Zdenek Wagner <
>> zdenek.wagner at gmail.com> wrote:
>> > Hi all,
>> > 
>> > I tried to ping tug.ctan.org without specifying the protcol and
>> > with
>> > IPv6 requested. This is my result:
>> > 
>> > [zw at math-gnostics ~]$ ping -c5 tug.ctan.org
>> > PING ftp.math.utah.edu (155.101.98.136) 56(84) bytes of data.
>> > 64 bytes from ftp.math.utah.edu (155.101.98.136): icmp_seq=1 ttl=33
>> > time=154 ms
>> > 64 bytes from ftp.math.utah.edu (155.101.98.136): icmp_seq=2 ttl=33
>> > time=154 ms
>> > 64 bytes from ftp.math.utah.edu (155.101.98.136): icmp_seq=3 ttl=33
>> > time=154 ms
>> > 64 bytes from ftp.math.utah.edu (155.101.98.136): icmp_seq=4 ttl=33
>> > time=154 ms
>> > 64 bytes from ftp.math.utah.edu (155.101.98.136): icmp_seq=5 ttl=33
>> > time=154 ms
>> > 
>> > --- ftp.math.utah.edu ping statistics ---
>> > 5 packets transmitted, 5 received, 0% packet loss, time 4007ms
>> > rtt min/avg/max/mdev = 153.873/153.980/154.067/0.077 ms
>> > [zw at math-gnostics ~]$ ping -c5 -6 tug.ctan.org
>> > ping: tug.ctan.org: Address family for hostname not supported
>> > 
>> > So the reason for timeout must be somewhere else, not in IPv6, the
>> > program would inform about it.
>> > 
>> > Zdeněk Wagner
>> > http://ttsm.icpf.cas.cz/team/wagner.shtml
>> > http://icebearsoft.euweb.cz
>> > 
>> > pá 2. 4. 2021 v 11:36 odesílatel Henri Menke via tex-live
>> > <tex-live at tug.org> napsal:
>> > > On 01/04/21, 23:17, AC wrote:
>> > > > Well, I know it's accessible, but the problem is specific to
>> > > > this
>> > pair of IPs.. I can ping
>> > > > - google.com just fine from that affected machine, and
>> > > > - tug.ctan.org from any other IPs I control (like my home
>> > computers).
>> > > > Could it be that the server is rejecting my connection (from
>> > > > that
>> > specific IP) due to some misconfiguration?
>> > > Could it be that you are on an IPv6 only network? The domain
>> > > tug.ctan.org only returns an IPv4 address.
>> > > 
>> > > Nevertheless, the problem is definitely on your side.
>> > > 
>> > > Cheers, Henri
>> > > 
>> > > > On April 1, 2021 11:02:54 PM EDT, Norbert Preining
>> > <norbert at preining.info> wrote:
>> > > > > On Thu, 01 Apr 2021, AC wrote:
>> > > > > > ping tug.ctan.org
>> > > > > > - time out on the affected machine, but
>> > > > > 
>> > > > > Nothing we can help you there. If you have root access, you
>> > > > > can
>> > try
>> > > > > traceroute to see where it hangs. The server is definitely
>> > accessible.
>> > > > > Best
>> > > > > 
>> > > > > Norbert
>> > > > > 
>> > > > > --
>> > > > > PREINING Norbert                             
>> > https://www.preining.info
>> > > > > Fujitsu                 + IFMGA Guide + TU Wien + TeX Live +
>> > Debian Dev
>> > > > > GPG: 0x860CDC13   fp: F7D8 A928 26E3 16A1 9FA0 ACF0 6CAC A448
>> > > > > 860C
>> > DC13



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