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Site inaccessible to me, accessible to others?

Not sure if this is the right spot to be asking this, but would love someone who could point me in the right direction or, at least, give me some ideas as to why this would happen...

I have a site that I can't get to.  Via Safari or FF, the server "takes too long to respond" and won't render.  Via Terminal (I'm on a Mac), attempting to SSH in to either the IP or the domain results in a Connection timeout.  If I ping the ip (or domain), from Terminal, it results in a 100% packet loss. However, if I go to networktools.com and ping the ip, it seems to work just fine.  

The site is hosted by a company that says they pull it up, but I've even driven to another city to attempt to access it and it still didn't work for me.  Not sure what to check, or whether this is something happening on my end or theirs, and not sure where to start looking?  

I'm hoping some people here can give me some ideas?
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Someone said they were able to get to a specific URL within the site, but I couldn't.  I'm not sure if it's possible that my MAC address is being filtered because if the host would need that in order to filter it, then there's no way they could have that information.  Is it something that I could check on my own computer?  To see if I'm, I don't know, filtering myself out? I just sent the client another email asking if they can get to the site's root domain via browser or SSH and I haven't heard back yet, but, I'm trying to check everything that I can think of.  To admit, I'm not a system or network administrator, so definitely out of my depth, but this seems really weird to me...
Ok, well that zeros in on your particular client having the problem if a colleague can access the site from your network. Are you using Windows 7? Try temporarily disabling the adv. firewall and recheck.
No, I'm on a Mac... Checking my Linksys Router configuration to see if there's something there, but, not sure what I'm supposed to be looking for... Just madly stabbing in the dark...
In that case, temporarily turn off the firewall. System Preferences / Security and Privacy / Click the Stop button.
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I'm not on a PC, I'm on a Mac.  And, my firewall is currently off.  It's a web site, hosted elsewhere.  But, I have SSH access as well.  The client, who is on a PC, *can* access the site via browser.  

I'm attaching some screenshots of my wireless router setup, just in case they're relevant somehow... I'm not sure what else to check?  

 User generated image User generated image
When you try to access this in a browser are you going to https or http? If https, and ssh also fails, then it might be possible that either the destination site is using old (SSL1) security, or, it is using newer (TLS1) and your mac cannot handle it. If you mac is reasonably new, and the browsers are up to date, then the latter is not likely. It might be more the case that it is SSL1, which is now normally rejected by current browser and ssh. Again, this is a shot in the dark, but is the destination site a commercial site that you would not expect to be using old security software?
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It's strange... Ping via terminal results in a 100% packet loss.  Traceroute via terminal results in:

 1  192.168.1.1 (192.168.1.1)  1.106 ms  0.744 ms  0.681 ms
 2  c-69-181-224-1.hsd1.ca.comcast.net (69.181.224.1)  41.306 ms  20.015 ms  36.323 ms
 3  te-7-1-ur02.dalycity.ca.sfba.comcast.net (68.87.197.53)  11.678 ms  18.272 ms  11.211 ms
 4  te-1-3-0-0-ar01.oakland.ca.sfba.comcast.net (69.139.198.114)  16.549 ms  18.467 ms  13.253 ms
 5  pos-2-5-0-0-cr01.sacramento.ca.ibone.comcast.net (68.86.90.9)  15.907 ms  24.247 ms  16.298 ms
 6  pos-0-4-0-0-cr01.sanjose.ca.ibone.comcast.net (68.86.85.50)  19.421 ms  18.784 ms  18.820 ms
 7  pos-0-0-0-0-pe01.11greatoaks.ca.ibone.comcast.net (68.86.86.54)  28.415 ms  25.206 ms  23.623 ms
 8  tenge13-3.br02.sjo01.pccwbtn.net (63.218.179.25)  28.399 ms  21.467 ms  144.702 ms
 9  gnax.ge2-14.br01.atl01.pccwbtn.net (63.216.31.138)  160.940 ms  95.844 ms  326.322 ms
10  atl-core-g-g1-6.gnax.net (63.247.69.178)  325.526 ms  345.799 ms  337.539 ms
11  core-gi1-1.nocdirect.com (209.51.131.90)  611.540 ms  351.620 ms  632.074 ms
12  deeja.nocdirect.com (209.217.237.150)  671.304 ms  84.494 ms  82.946 ms
13  * * *
14  * * *
15  * * *
16  * * *
17  * * *
18  * * *
19  * * *

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Ping via network-tools.com results in:

Ping 69.73.168.145

Round trip time to 69.73.168.145: 21 ms
Round trip time to 69.73.168.145: 21 ms
Round trip time to 69.73.168.145: 21 ms
Round trip time to 69.73.168.145: 21 ms
Round trip time to 69.73.168.145: 21 ms
Round trip time to 69.73.168.145: 21 ms
Round trip time to 69.73.168.145: 21 ms
Round trip time to 69.73.168.145: 21 ms
Round trip time to 69.73.168.145: 21 ms
Round trip time to 69.73.168.145: 21 ms

Average time over 10 pings: 21 ms

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Also, I'm accessing via http, but I did try https as well and there's no difference at all...

Well, went to http://www.downforeveryoneorjustme.com/ 
and typed in the domain... According to the site, it's definitely just me... I'm out of things to think to check... I even tried using OpenDNS to reconfigure my linksys router, but it still won't come up for me...
On the traceroute you posted, did you do it by ip or URL? If by ip, does nslookup resolve the domain name on your MAC?

The traceroute you have posted is only 1 hop away from the destination ip. Also, I observed that the page will only display if you use http and not https. This appears to be a hosting site with cpanel.

Have you contacted this site and asked if they could be blocking your ISP? I am assuming you don't have a fixed ip address at your site.
Ok... So, after a long and exhausting back-and-forth, turns out Comcast blocks ips if they detect "malicious data flows", but don't indicate anywhere that they do this or that it's been done... So... Thanks for trying to help, but, in the end... Comcast sucks.
points for trying to help and giving me lots of stuff for future reference...