Question about Cyberguard SG300 (00852503000366) Firewall

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Port 25 how do you open port 25 on this firewall?

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  • sgex Oct 19, 2007

    It's a Cyberguard SG300

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  • 110 Answers

Which Firewall?

Model and make please

Posted on Oct 19, 2007

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1 Answer

WHAT ARE THE PORT RANGES FOR ADDRESSES


Usable tcp and udp ports range from 1 to 65535. However you should not need to open any ports by default. Most routers include a stateful packet inspection (SPI) firewall. This is a fancy way of saying the router inspects the packet on it's way out to the internet when a computer on the inside of the firewall sends it out to the internet. The firewall will only allow connections from the internet on that TCP or UDP port if it returns from the original destination. For example, if you send a packet requesting the web page at cisco.com, the firewall will only allow traffic back into your network on TCP port 80 from the web server at cisco.com. If a packet from any other IP address tries to piggyback into your network through tcp port 80, the firewall will block it.

The only reason to open ports on your firewall is to allow a server inside your network to receive unsolicited traffic e.g. a web server inside your network may need TCP port 80 and 443 (HTTP and HTTPS) opened if you want to be able to access it from the internet. A mail server may need port 25 and 110 open for SMTP/POP e-mail. However, most home users do not host their own mail or web servers.

Mar 22, 2014 | Cisco Linksys Refurbished E3000...

1 Answer

I cant be able to send messages, or receive messages on my inbox.


your firewall is blocking you, make sure you have ports 25 and 110 open. go to "Canyouseeme.org" and type in your port number and hit enter. If there is an error message, then that port is blocked. ZoneAlarm is a firewall, McAfee has a firewall, so does windows and your router too. Have to check all the spots if you get error message at canyouseeme.org

spimn

Oct 18, 2013 | Yahoo Mail

1 Answer

Netgear firewall is blocking my email access. How do I fix?


It depends how you are accessing your email. If you are using a web based email such as gmail, I am guessing that a firewall is not your problem. If you are using an application such as Thunderbird and accessing a pop account, you may need to open up some ports in the firewall. Here are some common port numbers for email.

    POP3 - port 110
    IMAP - port 143
    SMTP - port 25
    HTTP - port 80
    Secure SMTP (SSMTP) - port 465
    Secure IMAP (IMAP4-SSL) - port 585
    IMAP4 over SSL (IMAPS) - port 993
    Secure POP3 (SSL-POP) - port 995











Mar 01, 2011 | NetGear WGR614 Wireless Router

1 Answer

Problem in Sonic FireWall


Check with your ISP for whether they have blocked Port POP3 Port 25 or not. also allow (Open) this port in Sonic Firewall also.

POP3 Default Port 25 but many provider use different Ports so also make sure that you configured correct port.

Feb 26, 2010 | SonicWALL TZ 210 WLS-N TOTAL-SECURE NTWK...

1 Answer

Firewall is blocking incoming emails


Do you have an email server in place? If so, you need to setup port 25 for inbound access to the IP address of the email server. I would suggest that you don't allow all as that will open up everything and kind of negates the reason to have a firewall. Some ISPs block port 25 though and use port 587.

If you don't have an email server then the problem might be with your email client configuration.

Apr 01, 2009 | D-Link NetDefend DFL-700 Firewall

1 Answer

Messages


You may just have to open port 25 on your Nokia firewall with a Rule... and make sure that you allow port 25 only from your server IP address.

Feb 13, 2009 | Nokia Computers & Internet

4 Answers

DL-524 send mail


Hi,

Are normal network services available to you:-

1) can you ping a server on the Internet?
2) can you browse the Internet?
3) Is the problem only email, if so do you know which mail server you are trying to access?

You shouldnt need to open up any rules in the firewall for SMTP, unless you are hosting a mail server. When you request mail from behind the firewall, most firewalls allow through all traffic from the inside network to the Internet. therefore, if you can see the Internet this is usually a good indication that theres no internal filtering.

all your mail client does is create a connection to port 25 on the SMTP server. You can replicate this by doing :-

telnet <MAIL SERVER ADDRESS> 25

you should get a banner or something up if you can see it. I dont think its a router problem if all other services are woking ok. If you get a banner from the above command, then its definately not a router problem.

ta,

Nov 13, 2008 | Computers & Internet

1 Answer

Port 25 Access


Are you running windows XP with the default windows firewall in operation? It is accessible from control panels -- could it be blocking/filtering port 25 -- this is not as much of a solution as a place for you to look on your machine -- I am running a 3rd party firewall that disables the windows firewall.

Dec 14, 2007 | Computers & Internet

1 Answer

Accessing ISP email account


There are numerous ports used and methods to send and recieve e-mail my setup uses the pop / smtp method where I believe the default ports are 110 / 25 however my ISP uses two other ports. Routers with port filtering enabled may allow 110 and 25 by default but are unlikely to permit other ports chosen by your or my ISP. The riskier change is to disable all port filtering. The safer option would be to open the ports required by your ISP (as well as closing the default ports that are unused).

In order to achieve this we will need to determine the ports you utilize for e-mail.

We will need to be able to access the router for configuration with a web browser.

A second option is that your computer has a firewall blocking your e-mail ports. However if this were true your e-mail would never work. The process is similar to the router in that the required ports would need to be open or the e-mail program given permission to access the internet in your computer's firewall program.

This could be a lengthy process determining your e-mail client accessing the configuration to determine the ports used. Determining if the router and/or the internal firewall are the issue and making the appropriate changes to one or both as determined necessary. If you, your neighbor or a friend is knowledgeable in these areas it may be easier to have them as

Dec 10, 2007 | NetGear WGR614 Wireless Router

1 Answer

Cyberguard SG300


From the main configuration screen select Network Setup, and then click on the Connections Tab. In the tabline below that click on Aliases.

At this point you input the Alias IP address and the netmask and add it, selecting port 25. The firewall now knows that it is to forward all traffic on port 25 to the computer that has the IP address you put in.

You should be aware that doing the above opens a direct access point into your network! Port 25 is the port used for SMTP (Sendmail) and it is the most vulnerable and most hacked service on the Internet! You should seriously consider not doing this.

A better option would be to goto the DMZ tab and configure a DMZ net on your firewall - you will need to obtain a second routable IP address from your ISP to do this though. By creating the DMZ and then routing port 25 to a machine inside the DMZ you isolate the machine running SMTP from all of the other machines inside your protected network and so make a compromise much less likely.

All of the systems inside your protected network will still have demand access to the machine in our DMZ, but the machine in your DMZ would be unable to initialize access to the protected network, which is a much safer setup.

Oct 19, 2007 | Cyberguard SG300 (00852503000366) Firewall

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