A sudden loss of connectivity...

Since February of 2008 I have had my network configured to allow me to send large files from work to home via DAV, DAVS, SFTP, FTPS and FTP (I enjoy tinkering with my set up). About a month ago everything came to an abrupt end and I have not been able to get it up and unning again, so here I am, hoping there will be some insight from you. My set up is as follows:
I use a DynDns URL (epconnect.dyndns.org) which correctly resolves to 98.224.193.135 to keep connected. If you want to try to check the connecions I have a test folder set up for FTP for user: test / Password: 20test09 and a folder set up or DAV using directory: DAVTest / user: test / Password: 20test09. I will watch for activity on these folders and keep them open for a month or so.
COMPUTERS I USED AS SERVERS IN TESTS:
Macintosh 01 - OS X 10.5.6 / Static IP 192.168.1.136 / PPC
Macintosh 02 - OS X 10.5.6 / Static IP 192.168.1.137 / Intel
ROUTERS I USED IN TESTS:
Linksys WRT54G 01 V. 6 - Firmware V. 1.02.6
Linksys WRT54G 02 V. 6 - Firmware V. 1.02.5
General network settings - Subnet 255.255.255.0 / Router address 192.168.1.1 / Apache 2.2.9 / httpd.conf file altered to allow WebDav / Web sharing enabled / File Sharing (FTP) enabled
All of the following tests were run both with and without the Macintosh firewall enabled, the results were the same in each case.
Tested http://localhost on Macintosh (01 and 02) in browser * - CONNECTED
Tested IP http://192.168.1.(136 and 137) in browser * - CONNECTED
Tested IP http://98.224.193.135 in browser * - FAILED
Tested IP http://epconnect.dyndns.org in browser * - FAILED
Tested IP ftp://192.168.1.(136 and 137) in browser * - CONNECTED
Tested IP ftp://98.224.193.135 in browser * - FAILED
Tested IP ftp://epconnect.dyndns.org in browser * - FAILED
Tested FTP for 192.168.1.(136 and 137) in CyberDuck ** - CONNECTED
Tested FTP for 98.224.193.135 in CyberDuck ** - FAILED
Tested FTP for epconnect.dyndns.org in CyberDuck ** - FAILED
Tested DAV for 192.168.1.(136 and 137) in CyberDuck ** - CONNECTED
Tested DAV for 98.224.193.135 in CyberDuck ** - FAILED
Tested DAV for epconnect.dyndns.org in CyberDuck ** - FAILED
At one point, just to test my router port forwarding, I enabled DMZ and forwarded ALL ports to 192.168.1.136 and 192.168.1.137 respectively but there was no difference in the results from the individual port forwards.
The Ping tests run on 192.168.1.136, 192.168.1.137, 98.224.193.135, and epconnect.dyndns.org all connected with no packet loss BUT in one case I forgot and had the ports forwarded to the Mac that I had TURNED OFF but still received a PASS! ***? I am guessing that Ping is worthless as a test to see if the site is responding because of this.
I ran a port scan from the DynDns.com Open Port Tool and all of the ports returned as OPEN using both epconnect.dyndns.org and 98.224.193.135. However I used the Macintosh utility Network Tool and ran a port scan from 21 to 443 (the only ones I need) for both epconnect.dyndns.org and 98.224.193.135 and both of the tests timed out returning NO OPEN PORTS.
I reset the Comcast Cable Modem (Arris TM502G/CT) with the CAT5 cable, the power cord, and the coaxial cable disconnected by pressing and holding the reset button on the modem for 20 seconds, waiting for all of the lights to come back on, then reattaching the router (NO CHANGE).
In desperation I reinstalled OS X on Macintosh 01 from scratch and reconfigured all of my settings but I STILL cannot get epconnect.dyndns.org to connect to FTP, SFTP, FTPS, DAV, or DAVS. Not even my test homepage will come up in the browser.
The following is an excerpt from Comcast:
I understand you have questions about which ports are blocked on the
Comcast network. I have included the current list of blocked ports for
you below:
67
68
135
137
138
139
445
512
520
1080
I am unsure what I could be missing. I spoke to Comcast a few minutes ago and they state again that they are not blocking th ports and there have been no changes in my service that could account or this. I also sent an email to DynDns.com and nothing is wrong on their end. I can't recall anything I changed on my Macs except for any recent upgrades from apple and I reset the routers back to factory spec and reentered all of the port routing by hand.
* Tested in browsers IE 7 and Safari 4 with a Dell PC and Firefox 3 and Safari 4 on a Macintosh.
** Tested FTP and DAV connectivity with EngInSite DataFreeway 2 on the PC and Cyberduck 3 on the Macintosh.
* I didn't bother testing FTPS or DAVS since the self signed certificate I use is for epconnect.dyndns.org and wont work on the local network.

Bump.
Any ideas?
This is a particular problem with users based in distant territories, e.g. South Africa. Our FMS is based in the UK.
I would imagine the number of hops in the connection is a big factor in this. Are there recommended FMS settings for this kind of scenario?
Ajay

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