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

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On 12/11/18 12:53 PM, Samuel Sieb wrote:
> On 12/11/18 12:11 PM, Beartooth wrote:
>> ssh -v beartooth@xxxxxxxxxxxxxx -p 999
>> debug1: Connecting to beartooth.info [208.100.51.176] port 999.
>> debug1: connect to address 208.100.51.176 port 999: Connection timed out
>> ssh: connect to host beartooth.info port 999: Connection timed out
> 
> I can connect to that port fine.  Do you have something like fail2ban on
> the server that would block your connection?  Can you try connecting
> from another location?

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:

-------------------- CUT HERE -----------------------------------------
# ssh -v -p 999 208.100.51.176
OpenSSH_5.3p1, OpenSSL 1.0.0-fips 29 Mar 2010
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to 208.100.51.176 [208.100.51.176] port 999.
debug1: Connection established.
debug1: permanently_set_uid: 0/0
debug1: identity file /root/.ssh/identity type -1
debug1: identity file /root/.ssh/id_rsa type 1
debug1: identity file /root/.ssh/id_dsa type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.4
debug1: match: OpenSSH_7.4 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.3
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-sha1 none
debug1: kex: client->server aes128-ctr hmac-sha1 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<2048<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Host '[208.100.51.176]:999' is known and matches the RSA host key.
debug1: Found key in /root/.ssh/known_hosts:40
debug1: ssh_rsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue:
publickey,gssapi-keyex,gssapi-with-mic,password
debug1: Next authentication method: gssapi-keyex
debug1: No valid Key exchange context
debug1: Next authentication method: gssapi-with-mic
debug1: Unspecified GSS failure.  Minor code may provide more information
Credentials cache file '/tmp/krb5cc_0' not found

debug1: Unspecified GSS failure.  Minor code may provide more information
Credentials cache file '/tmp/krb5cc_0' not found

debug1: Unspecified GSS failure.  Minor code may provide more information


debug1: Unspecified GSS failure.  Minor code may provide more information
Credentials cache file '/tmp/krb5cc_0' not found

debug1: Next authentication method: publickey
debug1: Trying private key: /root/.ssh/identity
debug1: Offering public key: /root/.ssh/id_rsa
debug1: Authentications that can continue:
publickey,gssapi-keyex,gssapi-with-mic,password
debug1: Trying private key: /root/.ssh/id_dsa
debug1: Next authentication method: password
root@208.100.51.176's password:
-------------------- CUT HERE -----------------------------------------

So, it could be that Comcast/Spectrum has blacklisted that IP or its
/24 block (appears to be owned by Netwisp, Inc.). Or that system is
doing something like reverse DNS lookups that aren't resolving and thus
blocking things.

Dunno which. Looks like an argument you need to have with Comcast to
see if they're blacklisting it and if so, why?
----------------------------------------------------------------------
- Rick Stevens, Systems Engineer, AllDigital    ricks@xxxxxxxxxxxxxx -
- AIM/Skype: therps2        ICQ: 226437340           Yahoo: origrps2 -
-                                                                    -
-                 IGNORE that man behind the keyboard!               -
-                                                - The Wizard of OS  -
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