we have experienced a simialr problem and asked Microsoft about it. This was their response:
" Thank you for writing to MSN Messenger Service.
We apologize for the inconvenience you experienced. If you are on a local area network behind a firewall (for example, a corporate network), you can talk to someone who is behind the same firewall that you are, but you cannot connect on a computer-to-computer call with someone outside the firewall.
We hope that this email has provided you with the assistance you needed.
Should you have further inquiries, please feel free to contact us again.
MSN Messenger Support "
And the same seems to apply for the File transfer issue, as tests we have performed show.
I assume that you are not blocking anything to go outside from the subnet connected behind the DMZ interface.suppose that your dmz subnet is 10.10.10.0/24 you have to apply the following access-list(example acl_outside) on your outside interface to allow file transfer via msn.
access-list acl_outside permit tcp any 10.10.10.0 255.255.255.0 eq 6891
for netmeeting to work you have to write this access-list statement
access-list acl_outside permit tcp any 10.10.10.0 255.255.255.0 eq h323
MSN file transfer and netmeeting are working or my LAN users here.I have tested it as I am myself a LAN user
DocumentationCode download linksGoalRequirementLimitationsSupported ISR
and UCS-E ModelSupported ISRG2 and UCS-E Blades:Supported ISR4K and
UCS-E Blades:Step by Step ConfigurationConfigure one of the connectivity
options to access the Cisco IMC from the n...
Firepower Threat Defense (NGFWv) on UCS E-series - Transparent Mode in
HA DocumentationCode download linksGoalRequirementLimitationsSupported
ISR and UCS-E ModelSupported ISRG2 and UCS-E Blades:Supported ISR4K and
UCS-E Blades:Step by Step ConfigurationCo...
Question I am currently unable to specify "crypto keyring" command when
configuring VPN connection on my cisco 2901 router. The following
licenses have been activated on my router :