Friday, December 16, 2011

Is there a way to get past a firewall to access a vpn?

My husband works for a university and we live in an on campus apartment. The university's network blocks me from connecting to my company's vpn.|||1) Find out what port your companies VPN is running on, ask your IT department. Many times they can set up on a different port that is unblocked. Port 80 and 443 are never blocked as it would stop web traffic and secure web sessions. If your company can switch you to one of those ports no problem.





2) Explain to the university IT department your problem and with the information you got above ask if they can create a solution.





3) If none of this works, get yourself a personal VPN known for blowing through this kind of blocked network. It will cost you a few dollars a month. Once you have blown through the University VPN just establish your regular company tunnel inside the personal VPN tunnel and everything will connect.





I have used SurfBouncer at several universities and corporate sites all over and it always gets through.|||Here is a list of ports and their associated services:





Port Service


20,21 FTP (File transfer)


22 SSH (Remote login secure)


25 SMTP (Internet mail)


53 DNS (Host naming)


80 HTTP (Web)


88 Kerberos (computer authentication protocol)


110 POP3 (Client access)


119 NNTP (Usenet newsgroups)


123 NTP (Network time)


137-139 NetBIOS (DOS/Windows naming)


143 IMAP (Client access)


161,162 SNMP (Network management)


163,164 CMIP (Network management)


443 HTTPS (Web secure)


514 Syslog (Event logging)


563 NNTPS (Usenet newsgroups secure)


993/tcp IMAP4 over SSL, Internet Message Access Protocol


995/tcp POP3 over SSL, Post Office Protocol


989,990 FTPS (File transfer secure)


1723 Virtual private network (VPN)





If the University is blocking the ports you need, you could ask if your husband's company uses Citrix.


The Citrix Secure access gateway uses port 443, which is usually open.

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