Re: F29 Wail at the Firewall (long; sorry!)

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On 12/11/18 1:52 PM, Ed Greshko wrote:
> On 12/12/18 5:25 AM, Rick Stevens wrote:
>> I just did the same. From a Spectrum IP here in Orange County, CA,
>> the system doesn't respond (and Spectrum is a Comcast company).
>>
>> From a monitoring system in our ASN (a /22 network), it works peachy:
> 
> Interesting....
> 
> Could you try it a second time?  I ask since I tried from Taiwan.  The first attempt..
> 
> [egreshko@meimei etc]$ ssh -v beartooth@xxxxxxxxxxxxxx -p 999
> OpenSSH_7.9p1, OpenSSL 1.1.1 FIPS  11 Sep 2018
> debug1: Reading configuration data /etc/ssh/ssh_config
> debug1: Reading configuration data /etc/ssh/ssh_config.d/05-redhat.conf
> debug1: Reading configuration data /etc/crypto-policies/back-ends/openssh.config
> debug1: /etc/ssh/ssh_config.d/05-redhat.conf line 8: Applying options for *
> debug1: Connecting to beartooth.info [208.100.51.176] port 999.
> debug1: Connection established.
> .
> .
> .
> The authenticity of host '[beartooth.info]:999 ([208.100.51.176]:999)' can't be established.
> ECDSA key fingerprint is SHA256:KC2aZ8T2NiqBIcjVVrhwXfPgHunj2BtECvty3QGEzxc.
> Are you sure you want to continue connecting (yes/no)? no
> 
> The second time...
> 
> [egreshko@meimei etc]$ ssh -v beartooth@xxxxxxxxxxxxxx -p 999
> OpenSSH_7.9p1, OpenSSL 1.1.1 FIPS  11 Sep 2018
> debug1: Reading configuration data /etc/ssh/ssh_config
> debug1: Reading configuration data /etc/ssh/ssh_config.d/05-redhat.conf
> debug1: Reading configuration data /etc/crypto-policies/back-ends/openssh.config
> debug1: /etc/ssh/ssh_config.d/05-redhat.conf line 8: Applying options for *
> debug1: Connecting to beartooth.info [208.100.51.176] port 999.
> ssh: connect to host beartooth.info port 999: Connection timed out
> 
> This happens with a system that is behind a router and the router is not pingable.
> 
> If I try from another host that is directly connected to the Internet and is pingable then
> connections work all the time.
> 
> I get the feeling the folks at Netwisp, Inc. are doing something to "prevent" hacking.

Yup. Tried three times from our ASN from two different machines. All
the test machines are behind a firewall (Cisco 65xx) and only one has
a reverse DNS record.

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- Rick Stevens, Systems Engineer, AllDigital    ricks@xxxxxxxxxxxxxx -
- AIM/Skype: therps2        ICQ: 226437340           Yahoo: origrps2 -
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-                      LOOK OUT!!! BEHIND YOU!!!                     -
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