[dba-SQLServer]Access to SQL through a firewall

Francisco Tapia my.lists at verizon.net
Wed Jun 18 10:24:33 CDT 2003


In general yes Arthur,  you are opening up your server to attack mostly
because 1433 is such a common port.   Instead with most firewalls what you
can do is NAT the IP address and the port effectivly removing all
recognition that it could be a SQL Server.  If FreeBSD supports this (and I
see no reason it shouldn't) see if you can re-route some abstract port other
than 1433 to port 1433 for your server.

-Francisco
http://rcm.netfirms.com/

On Wednesday, June 18, 2003 7:31 AM [GMT -8],
Arthur Fuller <artful at rogers.com> wrote:

: I should begin by saying that I know little about networking, etc.
:
: I have two connections to remote databases, both at colleges for whom
: I do occasional work. In both cases the network/DBA guys gave me an
: IP address, a UID and a PSWD. I opened ODBC and created a connection
: using the supplied specs, and it works like a charm. If I didn't know
: better, I'd think I was actually on their local LANs.
:
: I need to do this for another client, who doesn't have a network
: specialist on staff. One specialist did set everything up in the
: first place. FreeBSD firewall, Terminal Services box for remote
: access, database server for SQL 2000, etc. I want to explore the
: possibility of directly connecting to the db server, as I can do with
: the other two clients. I know next to nothing about freeBSD (but I do
: know some linux).
:
: Can anyone describe what needs to be done to the firewall to allow
: access to the db server? We are not using integrated security, so
: assuming that an attempt to connect gets piped to the db server, the
: user will still have to log in, to get access to the SQL db.
:
: Is there anything more to it than poking a 1433 hole in the firewall
: and directing said traffic to the db server?
:
: I have been pretty dictatorial about the passwords (no recognizable
: words, use numbers and #$%-type chars in your pswd, no pswds with
: fewer than 10 chars, etc.). Will poking a 1433 hole in the firewall
: expose said db server to serious risk?
:
: Arthur
:
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