Remote Desktop: One Way, But Not The Other?
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Posted by (PeteCresswell) on December 1, 2007, 8:54 am
Please log in for more thread options The other person's PC is connected directly to a Verizon DSL modem. If I issue a Remote Assistance invitation to the other PC, it can get to my desktop: no problem. OTOH, if they issue an invitation to me, I'm unable to connect to their desktop. All the appropriate checkboxes seem tb checked. I'm wondering it if might be something connected with the other PC not being behind a router. ? -- PeteCresswell | ||||||||||||||||||||||||||||
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Posted by Robert Redelmeier on December 1, 2007, 9:42 am
Please log in for more thread options Exactly. Your router also acts like a firewall and rejects _all_ incoming packets _except_ those from an established TCP session. These TCP sessions are established by outbound requests. Obviously a big security win. You can allow some packets inbound according to your router configuration pages. Usually under "servers" or "port forwarding". Make sure the servers on those ports do not have vulnerabilities. -- Robert | ||||||||||||||||||||||||||||
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Posted by (PeteCresswell) on December 1, 2007, 1:51 pm
Please log in for more thread options Per Robert Redelmeier:
>Exactly. Your router also acts like a firewall and rejects _all_
>incoming packets _except_ those from an established TCP session. >These TCP sessions are established by outbound requests. > >Obviously a big security win. > >You can allow some packets inbound according to your router >configuration pages. Usually under "servers" or "port forwarding". >Make sure the servers on those ports do not have vulnerabilities. Most of that is going right over my head. But at a gross level, it sounds backwards - like my PC sb the one resistant to allowing access by the other one instead of the way it is - which is that the other PC won't allow mine to access it. Also, somewhere under Assistance Request it seems to assert that it takes card of Windows Firewall automagically. Of course, no mention is made of the router..... so maybe we're back to my not fully understanding what you said above. -- PeteCresswell | ||||||||||||||||||||||||||||
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Posted by Robert Redelmeier on December 2, 2007, 9:08 am
Please log in for more thread options > But at a gross level, it sounds backwards - like my PC sb the one
> resistant to allowing access by the other one instead of the way > it is - which is that the other PC won't allow mine to access it. No, your PC isn't resisting access. Your hardware firewall will not allow the request in because it started from outside. It only allows data in that is on a connection started from the inside. > Also, somewhere under Assistance Request it seems to assert that
> it takes card of Windows Firewall automagically. MS-Windows firewall is a software appendage onto the MS-Windows OS. It can certainly be programmed to pass RA. But how will your external router (a small computer) know anything about MS-RA? It just shovels packets. -- Robert | ||||||||||||||||||||||||||||
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Posted by (PeteCresswell) on December 2, 2007, 9:48 am
Please log in for more thread options Per Robert Redelmeier:
>No, your PC isn't resisting access. Your hardware firewall will
>not allow the request in because it started from outside. It >only allows data in that is on a connection started from the inside. But it's the *other* end that has the problem. My PC allows access. The other end, however, resists access - and it is not behind a router, unless the DSL modem counts as such. -- PeteCresswell | ||||||||||||||||||||||||||||
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>
> The other person's PC is connected directly to a Verizon DSL
> modem.
>
> If I issue a Remote Assistance invitation to the other PC, it can
> get to my desktop: no problem.
>
> OTOH, if they issue an invitation to me, I'm unable to connect to
> their desktop.
>
> All the appropriate checkboxes seem tb checked.
>
> I'm wondering it if might be something connected with the other
> PC not being behind a router.