tcp

TechRepublic Resources

• sort by:
• Relevance
• Date
• Popularity

List open ports and listening services

As mentioned in the article, "10 security tips for all general-purpose OSes," you should turn off any services you don't actually need so that they will not become avenues of attack for security threats. Ten specific services for Microsoft Windows were mentioned in my later article, "10 services to...

Tags: Linux Distribution, Network, FreeBSD, TCP, Unix System, Service, Tcp/Ip, UNIX, Operating Systems, Open Source, Linux, Networking, Software, Chad Perrin

Blog posts 2008-04-15

The evolution of UC with Windows Mobile devices

Much has been written about Microsoft's Unified Communications initiative in terms of Office Communications Server 2007 and Exchange 2007. The "missing link" is the ability for today's mobile devices - handheld PDA phones and smartphones - to integrate with those server products for a total UC experience for end users....

Tags: Phone, Device, Microsoft Windows Mobile, Mobile, Microsoft Office, TCP, DirectPush, Office Communicator 2007, Office Communicator Client, Advertising & Promotion, Pocket PC, Microsoft Windows, Operating Systems, Handhelds, Marketing, Hardware, Software, Deb Shinder

Blog posts 2008-02-01

Use tcpdump for network debugging

Tcpdump is an extremely useful network packet tracing system. While not as feature-rich as programs such as Wireshark, its packet "dump" output can be used as input by other programs to analyze the dump. In a pinch, and for network debugging, tcpdump works wonders. For instance, if...

Tags: Network, IP, TCP, Tcpdump, Tcp/Ip, Networking, Network Technology, Vincent Danen

Blog posts 2008-01-25

pix 525 dmz probleme

Dear Guyswe are having probleme in dmz zone.from insidei cant access any of the dmz why i cant now but from outside it is access able i can ping from inside to the inside interfaceof the firewall but from dmz i cant ping insideor from inside i cant reach...

Tags: TCP/IP, NETWORKING, Network technology, DMZ, saumair@..., access-list, TCP, IP

Discussion threads 2007-11-19

Why i can't telnet a particular port even if the port(tcp) is open

I'm having a problem connecting to some clients running WinXP via a particular porttcp. The port has been opened at the windows firewall. Everything seems ok. I could PING-no problem. But when i try to telnet that particular port, it failed. Can someone please tell me what could be the...

Tags: Microsoft Windows XP, Microsoft Windows XP Professional, TCP, jobs4vjlx16@..., Telnet

Discussion threads 2007-11-12

Open ports on Cisco 871W

Hi,I'm new to the world of Cisco. I recently bought an 871W router to become familiar with cisco products. Thanks to George Ou's template and David Davis' articles I was up and running in no time. I had to modify some things in order for it to...

Tags: TCP/IP, NETWORKING, Network technology, SynapsE_z, IP, TCP, static tcp, router, Cisco Systems Inc.

Discussion threads 2007-11-09

PIX PPTP VPN

HiI have configured pptp on a PIX 506E ver 6.2(2)The PPTP terminates ok on the PIX but vpn clients can't access any resources on the LAN no icmp ping reply either. I have remove use default-gateway on remote from PPTP client and still doesn't workAny ideas?Here is the config.Building configuration...:...

Tags: TCP/IP, NETWORKING, VPNs, Network security, Network technology, roppong@..., VPN, X.X.X.X, TCP, PPTP, IP

Discussion threads 2007-11-08

End-user problem - TCP/IP + user privileges

Hi I was wondering if anyone could help me.One of my users works out of the office a lot and has asked me to set up his XP laptop so that he can use his home broadband connection, (for email etc.) He currently does not has sufficient user privileges to...

Tags: Network technology, NETWORKING, Internet service providers (ISPs), Routers & switches, mr.sweetchuck, TCP, TCP/IP, router, broadband

Discussion threads 2007-10-25

Cisco ASA 5505 - VPN Access to DMZ Network

I have a Cisco ASA 5505 w/ Security Plus license.Three VLANs are configured: Outside, Inside, DMZNAT and Access Rules are successfully configured which enable:- Internet access for hosts on the Inside network- DMZ access to webserver for hosts on the Inside network- DMZ access to webserver for hosts on...

Tags: Web servers, NETWORKING, TCP/IP, LANs, brendan.smyth@..., VPN, Cisco Systems Inc., DMZ, Web server, IP, TCP

Discussion threads 2007-10-12

Internal network problem since NAT rule was created on perimetal pix

Helo,Since I created a NAT rule on my Cico PIX 506E running software version 6.3(5) and PDM version 3.0(4) to enable Outlook Web Acces, I got this issue:When user open Outlook, it can't connect until few minutes to the server located on the same subnet. Every user got this problem....

Tags: TCP/IP, NETWORKING, anaqc01@..., internal network, Network Address Translation, NAT rule, IP, server, TCP

Discussion threads 2007-10-05

Require web traffic through proxy with exceptions on Cisco IOS

I have a Cisco 871w router that provides my SOHO location internet access. I have a proxy/filtering solution as well Dansguardian installed on an Ubuntu server. I want to require that all web-bound (port 80/443) traffic goes through the proxy, but need to provide some exceptions as certain OK sites...

Tags: TCP/IP, NETWORKING, Network technology, michael@..., TCP, Cisco IOS, IP, access-list, Cisco Systems Inc.

Discussion threads 2007-10-01

cant access via vnc from outside

hi alli opened two ports on my router for vnc liketcp 5800 5800tcp 5900 5900and give the ip address of the server on which we instaled the vnc.but still i cant access tht server from out side..any body tell me whts is the probelm or what else i need to...

Tags: TCP/IP, NETWORKING, umar_q50@..., TCP, UDP, VNC, server

Discussion threads 2007-09-26

PPTP VPN through a Cisco PIX

Ok, here is my dilemma, I've been trying to setup a simple PPTP VPN at our office so a few employees can VPN to our server once they move. Internally, the connection works perfectly, so I know the issue is with the traffic being routed through our firewall. ...

Tags: TCP/IP, NETWORKING, VPNs, Network security, Network technology, E-mail, Cisco Systems Inc., OK Here, Cisco PIX Firewall, jdaly@..., WHS, X.X.123.197, pdm location, PPTP, IP, TCP

Discussion threads 2007-09-18

Outlook with Squid transparent Proxy

Dear AllI have squid proxy server running in my office, my users are able to access internet through thier browser which is pointing to squid, but my outlook users are not able to send / receive mail. Configured proxy as transparent proxy mode and also have iptables script ...

Tags: TCP/IP, NETWORKING, Microsoft Outlook, bubloob_13@..., TCP, UDP

Discussion threads 2007-09-16

PIX 501 config for Win2k RRAS VPN, FTP, Exchange

I may not have the terminology correct, but what I'm trying to accomplish is to allow employees to work from home, using VPN to connect to office network. VPN is hosted on Win2K RRAS, which was working fine with port forwarding (1723) on Linksys DSL router (the PIX ...

Tags: TCP/IP, NETWORKING, VPNs, Network security, hq@..., Microsoft Windows 2000, TCP, PIX, VPN, FTP

Discussion threads 2007-09-05

Why you need to know Cisco IOS ACL port numbers

When working with the Cisco IOS, it's very important to know your TCP and UDP port numbers. This is especially true when creating IOS access control lists ACLs. Let's take a closer look. What's a port number? Most of you likely know what port...

Tags: Cisco IOS, Telnet, Router, IP, TCP, Cisco Systems Inc., Access Control, Internet Assigned Numbers Authority, Protocol Number, David Davis

Blog posts 2007-08-31

Cisco Config w/NAT .. not doing its thing

hi all, maybe someone here can assist. trying to get natting on my cisco 1700 series router to work but its not. been 4 days at this and still nothing. just trying to host my own website. online remote scans are saying that port 80 (and all ports i am...

Tags: TCP/IP, NETWORKING, Network technology, chuck_v@..., Cisco Systems Inc., TCP, IP, static tcp

Discussion threads 2007-08-30

Microsoft VPN (RRAS) through D-Link DIR-655 = ARGH!

Hi everyone. I'm absolutely stumped as to why I cannot make my VPN accessible from outside the network. Previously, I had a Linksys WRT54GS with the Thibor firmware. It worked like a dream. This new router is nothing short of amazing, but I can't get the...

Tags: VPNs, NETWORKING, Network security, TCP/IP, Routers & switches, TELECOMMUNICATIONS, Microsoft Corp., chris@..., RRAS, D-Link Systems, VPN, Generic Routing Encapsulation packet, Generic Routing Encapsulation, router, VPN Server, UDP, TCP, firewall

Discussion threads 2007-08-21

Bandwidth Delay Product Calculation / TCP Window Size tuning

I am attempting some tuning of a windows network, with a 2 MB Wan link. There are quite a few documents on the subject with quite an array of advice, but not much depth. Specifically, I understand how to compute the Bandwidth*Delay Product, but I am not clear as to...

Tags: TCP/IP, shardeth, MSS, TCP

Discussion threads 2007-08-17

Cisco PIX 601 6.3.1 Cannot port forward 53?

Hello, I'm trying to run SSL Explorer as as VM-ware appliance behind the firewall... I know for a fact all I need is TCP 53 since my school only let's 80 and 443 and 53 outbound (but I'm using up 80 and 443 already) all my other 1:1 mappings work....

Tags: TCP/IP, NETWORKING, Cisco PIX Firewall, chow@..., Cisco Systems Inc., TCP

Discussion threads 2007-08-08