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Posts Tagged Firewall

04.29.2010

[DBNETLIB][ConnectionOpen (Connect()).]SQL server does not exist or access denied

This may be due to a firewall issue – in particular Allow inbound SQL Server Browser UDP 1434
See further info on opening relevant firewall ports here:
http://technet.microsoft.com/en-us/library/ms175043.asp
Regards,
Brendan

10.3.2009

Editing firewall.local settings in Linux CentOS

Short method:

Login as the root user – I use putty for windows to connect to the linux server from my desktop
after logging in enter ls – you may have a firewall script to edit the iptables. For this example we have one called firewall.local
Copy the file using cp firewall.local firewall.todaysdate to you have a copy [...]

08.6.2009

RDP to Internal server or workstation through ISA firewall

To setup a firewall rule to enable access through ISA to internal servers, you need to map different external ports to the interal port 3389.
In this example an internal system is on 192.168.10, and you want to RDP on port 3390 to this server.
Right-click firewall policy and select new – server publishing rule
Give it a [...]

05.14.2009

Allow inbound echo request (ping) in sbs windows firewall policy

Dsa.msc > Right click you domain. > click group policy > open > sbs windows firewall >
computer configuration > administrative templates > network > network configuration
> windows firewall > domain profile > windows firewall : protect all network
connections.
Run Gpupdate /force

04.28.2009

Active FTP vs. Passive FTP and firewall issues

The Basics
FTP is a TCP based service exclusively. There is no UDP component to FTP. FTP is an unusual service in that it utilizes two ports, a ‘data’ port and a ‘command’ port (also known as the control port). Traditionally these are port 21 for the command port and port 20 for the data port. [...]

04.17.2009

Got a Billion BiPAC 7404VGP? Can’t access a website?

We couldn’t get to google maps today. We recently adjusted the firewall seetings in our BiPAC 7404VGP but didn’t make any changes that should have affected google maps. Looking at Status / Event Log showed me that an address with a Source Port of 80 was being blocked by a blacklist. By going into the [...]

02.3.2009

Blocking streaming media ports in a firewall

After being hit with a few $700 and $800 excess charges by Telstra, who refuse to do anything about it and provide no warning system (they make more money that way) I was having a hard time figuring out how we were downloading 1Gb+ per day on a connection which was just being used for terminal [...]