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Re: openvpn in spite of firewalls



On Wed, Jul 18, 2007 at 10:57:10AM -0700, David Brodbeck wrote:
>
> On Jul 18, 2007, at 10:15 AM, PETER EASTHOPE wrote:
>
>> Folk,
>>
>> I've installed openvpn on two systems and tried some
>> configurations including Example 2 from the man page.
>> Seems that firewalls block successfully (sarcasm).
>> Nevertheless, http, ssh, ftp and a few other protocols
>> work.
>
> If you control the firewalls, the obvious answer would be to open the port 
> that OpenVPN is using.  But I assume you'd have done that already if that 
> was the case.
>
> Ideally, you could find a port the firewall doesn't block that you're not 
> using for other purposes.  For example, many firewalls allow HTTPS on TCP 
> port 443, so you could try that one.  UDP port 53 is another possibility; 
> it's usually left open for DNS purposes.

The rfc that details proxy's (if you trying to get through a corporate firewall 
and they have a proxy), is to allow port 563 through as well as 443 (https).  
563 is nntps - strangely a lot of proxies are by default configured to let this 
through.


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