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Get a new ISP.
It's not the ISP as previously pointed out. The line is losing sync.
Ports being blocked is definitely an ISP issue.
Even so if your ISP can't do the leg work for you with Telkom then they are useless anyway.
But you know what do I know I'm with Mweb the worst ISP around according to this forum...yet never have these issues.
I've yet to find an ISP that will block ports on single users account.
But it's more like (in fact it's only possible) for the ISP to do it than Telkom who only supply the line.
Do not buy the Cisco/Linksys WAG120N. There is a flaw in the PPP/CHAP/PAP authentication code, that basically annoys the living hell out of the MSAM causing it to refuse to authenticate the modem for a time-out period. What I have done is to put the WAG120N into WAN mode i.e. internal modem is powered down, and uses one of the ethernet ports as a WAN port, and use the Telkom branded NETGEAR router as a modem only. This works like a charm.
I actually found that with just about every Router I've ever used that you have authentication issues on certain ISP's after a reboot.
So instead I just switch it off for five minutes and then switch it back on instead of doing an instant reboot.
Even have this with MWeb's own router now.