Remoting 1.1 and Firewalls

[Dave Girvitz]

I've had an application that has been working for about a year that uses an
HTTP channel with a Binary Formatter. The other day, my client installed a
FreeBSD firewall and now the application has stopped working. He says that
he has opened the configured port to enable communication between server and
clients. Now, according to his traffic monitor, he says that the port used
to return values from the server is different from the configured port.
This is not the behavior that I thought would be happening. I know that
remoting events are returned on an arbitrary port designated by the client
at run time, but I thought normal method invocation (sao, singleton) occured
on the same port.

Could someone clarify if this is the situation and how I can get around it.

Thanks,
Dave Girvitz, MCAD

 

[Doug Forster]

Hi Dave,

You might like to check out www.genuinechannels.com

Cheers

Doug Forster

 

[Sherif ElMetainy]

Hello

The client uses any free port > 1024 when connecting to the server. If this
port is blocked by the firewall communication will fail.
This is not the same as the server configured port.
In the firewall there must be a rule to allow TCP traffic with destination
IP address and port matching those of the server.
and another rule to allow TCP traffic with source IP address and port
matching those of the server.

The first rule will allow the client to send packets to the server, the
second rule will allow the server to reply to the client.

Best regards,
Sherif

 

[Jeffrey Tan[MSFT]]

Hi Dave,

Does the community's reply make sense to you? Do you still have concern on
this issue?

Please feel free to feedback. Thanks

Best regards,
Jeffrey Tan
Microsoft Online Partner Support
Get Secure! - www.microsoft.com/security
This posting is provided "as is" with no warranties and confers no rights.