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UltiDev Web Server Pro not working behind stunnel
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mburgett
#1 Posted : Saturday, March 3, 2012 9:12:17 PM(UTC)
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Hello,

We have a server behind the firewall that used Cassini web server. We set up an stunnel on our firewall, and everything was working correctly.

I upgraded the app today, and it uninstalled Cassini and installed UltiDev Web Server Pro 2.0.010. Everything *except* access through the stunnel seems to be working fine. (access from other machines behind the firewall, and access through a normal port redirection at the firewall)

I note other stunnels (to other services, like redmine, and Code Collaborator) continue to work fine, and show a very similar packet structure when I sniffed them.

I have a wireshark capture of the stunnel->UltiDev Web Pro traffic. I thought it was odd that the first packet through to Web Pro contains only the 'G' and the 2nd payload begins 'ET / HTTP...' but it doesn't seem to bother the other services hosted on the internal network.

I've attached the wireshark capture of the packets, up to and including the timeout-reset from Web Pro.

Has this been tested with stunnel, and are there any special config settings needed on either side?


File Attachment(s):
stunnel_connect.zip (2kb) downloaded 107 time(s).
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Ultidev Team
#2 Posted : Saturday, March 3, 2012 11:01:01 PM(UTC)
Ultidev Team

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Hi there!

Unlike UltiDev Cassini, which uses plain sockets to get requests, UltiDev Web Server Pro (UWS) uses HTTP.SYS kernel driver (a.k.a. http server API) - same as IIS 6 and 7. Everything related to networking is now going through http.sys. If the box in question has IIS 6 or 7 on it, could you please try to reach an IIS site via stunnel to ensure the problem is UWS-specific, and not http.sys-stunnel conflict. We didn't test with stunnel, so unfortunately we don't know what is going on.

If you use stunnel just to get encryption/identity, consider using the latest UWS (build 15 as of time of writing) - it now supports SSL.

Best regards,
UltiDev Team.
Please donate at http://www.ultidev.com/products/Donate.aspx to help us improve our products.
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mburgett
#3 Posted : Sunday, March 4, 2012 1:18:39 PM(UTC)
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Ultidev Team;3553 wrote:
Unlike UltiDev Cassini, which uses plain sockets to get requests, UltiDev Web Server Pro (UWS) uses HTTP.SYS kernel driver (a.k.a. http server API) - same as IIS 6 and 7. Everything related to networking is now going through http.sys. If the box in question has IIS 6 or 7 on it, could you please try to reach an IIS site via stunnel to ensure the problem is UWS-specific, and not http.sys-stunnel conflict. We didn't test with stunnel, so unfortunately we don't know what is going on.


Thanks for your response, but no I don't have IIS on this box, which why it was originally using the Cassini server.

Ultidev Team;3553 wrote:
If you use stunnel just to get encryption/identity, consider using the latest UWS (build 15 as of time of writing) - it now supports SSL.


The stunnel runs on the machine that has the cert assigned for the address, so I don't think using SSL on the box behind the firewall is an option without adding certs.

Is there any logging I can enable on Web Pro that will help diagnose the problem with the stunnel packets?

Thanks,
Mike
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Ultidev Team
#4 Posted : Sunday, March 4, 2012 2:26:05 PM(UTC)
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We are afraid it's impossible to trace packets all the way to UWS - the listening occurs in http.sys, which is a kernel-level driver, and UWS receives pre-parsed http request and has no access to TCP/IP stack. However, if you research this issue as related to IIS, you may find hepful information.

If you need SSL, UWS has a complete step-b-step document explaining how to get real free server certificate for an Internet web domain.

We are sorry we could not help with stunnel.

Best regards,
UltiDev Team.
Please donate at http://www.ultidev.com/products/Donate.aspx to help us improve our products.
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mburgett
#5 Posted : Sunday, March 4, 2012 4:48:28 PM(UTC)
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Ultidev Team;3555 wrote:
We are sorry we could not help with stunnel.


Yes, me too. Since all stunnel is doing is the SSL portion,and sending regular http thru to the internal server this seems like an odd attitude, but it's your option, I just thought you might want to know you'd created a regression issue with Web Pro. (Neither Apache, P4Web nor Code Collaborator have an issue with stunnel, so the problem must be in the Web Pro/http.sys implementation, I would suspect.)

I'll investigate other options. Thank you for your time.
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Ultidev Team
#6 Posted : Sunday, March 4, 2012 6:16:42 PM(UTC)
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Hello!

We have duly noted the issue, but unfortunately we do not have resources to troubleshoot this issue right now. We are sorry we could not help.

Best regards,
UltiDev Team.
Please donate at http://www.ultidev.com/products/Donate.aspx to help us improve our products.
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