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Hello Skunk,
I also have comcast as an ISP. However, I have no problems using changeip.com for all my needs. I am not sure which plan you have ( normal or pro ) but with the ease of the online control panel I do not have to even use the update script on the server to maintain my IP. The pro IPs only changes once a year if that.
I am not sure of the configuration on apache, however on my win2k3 server I am able to run many sites from one IP using host headers without any problem at all. I am also not aware of any ports that are blocked. I use mail on the secure port 5072. I host my sites all on port 80 and ftp on 21.
If there is anything I can help you with please do not hesitate to ask.
Kind regards,
symcorr
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