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Conference noted::pwdoswinv5

Title:PATHWORKS V5 for DOS and Windows
Notice:OS2LAN::OS2:[PUBLIC] is alive again, but not what it used to be
Moderator:RANGER::CURLESS
Created:Fri Feb 11 1994
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:7404
Total number of notes:27276

7347.0. "Firewalling NetBIOS-over-IP Problem" by GEC013::ZIGLER (Tom Zigler DTN 435-7979) Tue Mar 04 1997 10:18

    We have Windows NT/95 clients on the inside of an AltaVista Digital
    UNIX Firewall with a Windows NT V3.51 server and PATHWORKS for OpenVMS
    V5.0A server both on the outside of the firewall.  We are running the
    TCP/IP protocol exclusively.
    
    We defined a Start-of-Connection packet filter in the firewall that
    enables a Windows NT/95 client to make an outbound initiated connection
    to either server on port 139/TCP but permits only the corresponding
    inbound connection as an ACKed response.  In other words, a reverse
    inbound initiated TCP connection from either server is not allowed by
    the firewall.
    
    The Windows NT/95 client can successfully connect to a share point
    offered on the Windows NT server but NOT to the PATHWORKS OpenVMS
    server.
    
    A sniffer analysis of the Windows NT/95 to PATHWORKS NetBIOS-over-IP
    attempted connection to port 139/TCP reveals that this server performs
    a reverse inbound intiated connection back to the client - ugh!
    
    Can anyone explain why this difference exists?  Is there any way around
    this problem?
    
    Please advise.
    
    
    				\Thanks in Advance
    
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7347.1nova05.vbo.dec.com::BERGERTue Mar 04 1997 12:535
The license check maybe ?
Anyway, this probably belongs more to the V5 VMS server conference 
since no PATHWORKS client is involved.

	Vincent