Re: While we’re talking about networking…

[Philip Pedersen]

I looked at a few sites that check the IP Blacklist.  One site, https://dnschecker.org/ip-blacklist-checker.php,  shows that your IP address is on a blacklist from dnsbl.spfbl.net. Other blacklist check sites didn’t show that, even for that specific list, but it may be that your ISP is using a a list that blocks your IP.  There’s a writeup on the dnschecker website that explains what may cause your IP to be on the list and what to do about it.  That might help.  

Good luck

Phil

> On Jan 3, 2023, at 11:02 AM, WILLIAM J HUSLER <bhusler at me.com> wrote:
> 
> Just a couple of thoughts. I see that SiteGround was originally founded in Bulgaria and syill has data centers there. Given today’s geopolitical environment, it’s quite possible that your ISP things they are doing you a “favor” by blocking suspect IPs. Do you know and do you have control over which Data Center SitGround uses to host your servers? Other possibility that comes to mind is that Siteguard might have detected suspicious traffic from your ISP and blocked your IP address. Since you are not getting anywhere with your ISP, I would pose those two questions to Siteguard. (1. Where are your servers, 2. Is your IP blocked) At least it’s worth a try.
> 
> Bill
> 
>> On Jan 3, 2023, at 6:35 AM, Tom Yarmas <tom at yarmas.com> wrote:
>> 
>> That is very strange. Almost sounds like the ISP is blocking things for some reason. I have no idea what the answer might be, but am wondering if a VPN makes any difference?
>> 
>> -tom
>> 
>>> On Jan 3, 2023, at 9:16 AM, chad at holeinthewoodsfarm.com wrote:
>>> 
>>> While we’re talking about networking, and knowing this is a tangential topic, maybe someone can help troubleshoot an issue I’m having.  I’m 99.9999% sure the problem is with my awful ISP and/or their router.  But their tech support is beyond useless.
>>> 
>>> So, we have websites and email hosted elsewhere (siteground).  We cannot access either (anything on the holeinthewoodsfarm.com domain) from our network.  We can access it fine from anywhere else in the world (hence why I’m always emailing from my iPhone…).  We can access the rest of the internet with no problem.  Just not our own domain.
>>> 
>>> It doesn’t care about device or OS: mac, windows, Debian, raspbian, iOS, android all the same.
>>> 
>>> It’s not our Unify network: I took an old Mac mini that has been in a drawer for 18 months, plugged it in to the ISP’s router via Ethernet, and get the same behavior.
>>> 
>>> Technically, it’s not our domain.  It’s the server that hosts it.  Doing a reverse dns lookup, there are 23 domains hosted on the server.  Can’t access any of them.
>>> 
>>> It’s not a problem with my dhcp server: all of the devices are getting correct info.  And it fails when I manually configure a device, too.
>>> 
>>> It’s not a problem with my internal dns server - I removed it and only used major dns servers, no change.  And no difference when going directly through the ISP’s router, which is outside of our LAN with the dns server (it couldn’t see it if it wanted to, so it’s not getting a faulty response from it).
>>> 
>>> Ping and traceroute actually find the server just fine.  So perhaps it’s limited by protocol or port (http, https, ftp, smtp, imap, ssh all fail)?
>>> 
>>> Siteground can access a web server on our local network from their server that’s hosting our domain.
>>> 
>>> It sucks having to drive 15 minutes to check email or update our web store…. But I have too little hair left to pull any more…
>>> 
>>> Sent from my iPhone
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