Sign in with
Sign up | Sign in
Your question

Remote Assistance can't resolve host name error

Last response: in Windows XP
Share
Anonymous
September 17, 2004 11:19:23 PM

Archived from groups: microsoft.public.windowsxp.work_remotely (More info?)

When trying to work with another user through Messenger, the other user
requests Remote Assistance. I accept, but then get an error that says the
other user's host name can't be resolved. Any help would be appreciated.
Anonymous
September 17, 2004 11:19:24 PM

Archived from groups: microsoft.public.windowsxp.work_remotely (More info?)

Are either you or the other party behind a firewall/NAT/router?

http://support.microsoft.com/default.aspx?scid=kb;en-us;301529

Its possible opening TCP Port 3389 on any firewall/NAT/router may help with this issue.
Alternatively you might try the file or email invitation method and modify the RCTICKET field in the
invitation file to reflect the true public IP of the PC issuing the invitation...

http://support.microsoft.com/default.aspx?scid=kb;en-us;300692

--
Al Jarvi (MS-MVP Windows Networking)

Please post *ALL* questions and replies to the news group for the mutual benefit of all of us...
The MS-MVP Program - http://mvp.support.microsoft.com
This posting is provided "AS IS" with no warranties, and confers no rights...

"Stuffin" <Stuffin@nonsense.com> wrote in message
news:%MG2d.19863$ZC7.15535@newssvr19.news.prodigy.com...
> When trying to work with another user through Messenger, the other user requests Remote
> Assistance. I accept, but then get an error that says the other user's host name can't be
> resolved. Any help would be appreciated.
>
Anonymous
September 18, 2004 4:43:24 PM

Archived from groups: microsoft.public.windowsxp.work_remotely (More info?)

"Stuffin" <Stuffin@nonsense.com> wrote in message
news:%MG2d.19863$ZC7.15535@newssvr19.news.prodigy.com...
>
> When trying to work with another user through Messenger, the other user
> requests Remote Assistance. I accept, but then get an error that says the
> other user's host name can't be resolved.

If the person requesting Remote Assistance is behind a NAT router, then that
router must have UPnP enabled, and Windows XP must be running the SSDP
Discovery Service (the default, though some users mistakenly switch it off).
This is required so that the remote assistance request application can
discover the true WAN IP address of the requester, rather than the local LAN
private IP address. The UPnP functionality of the router will look after
forwarding TCP port 3389 automatically.

If the person requesting Remote Assistance is running a firewall, then the
firewall must have the following open ports:
- TCP port 3389 from the internet (for the Remote Assistance inward call
from the expert);
- TCP port 2869 from the local subnet (for UPnP)
- UDP port 1900 from the local subnet (for UPnP)

If the firewall is the Windows Firewall, this can be accomplished by
checking the Exceptions for "UPnP Framework" and "Remote Desktop".

It should not be necessary to make any special router or firewall
configurations at the Expert end of the link.

--
Robin Walker [MVP Networking]
rdhw@cam.ac.uk
Anonymous
September 19, 2004 4:23:17 PM

Archived from groups: microsoft.public.windowsxp.work_remotely (More info?)

Thanks to everyone who suggested remedies for this problem. I discovered
that the problem was indeed a firewall, specifically ZoneAlarm. Having the
"requester" temporarily turn-off ZoneAlarm allowed Remote Assistance to
work. Thanks again for all the input



"Stuffin" <Stuffin@nonsense.com> wrote in message
news:%MG2d.19863$ZC7.15535@newssvr19.news.prodigy.com...
> When trying to work with another user through Messenger, the other user
> requests Remote Assistance. I accept, but then get an error that says the
> other user's host name can't be resolved. Any help would be appreciated.
>
!