[squid-users] Skype for Business behind a transparent squid (TProxy) HTTP/S

Sameh Onaissi sameh.onaissi at solcv.com
Mon Dec 5 22:46:44 UTC 2016

I have a Ubuntu 16.04 server with Squid 3.5.22 installed. It acts as a gateway in a LAN.

It is configured to intercept HTTP and HTTPS traffic (Transparent). So iptables redirects were used for ports 80 and 443.

The server runs two scripts:
nat.sh to bridge the two network cards, allowing LAN computers access to the internet through the servers Internet interface card.
iptables.sh which defines the ip rules and port forwarding: http://pastebin.com/SqpbmYQQ

BEFORE RUNNING iptables.sh...

When I connect a LAN computer to it, everything works as expected. Complete Internet access with some HTTP and HTTPS domains blocked/redirected to another page. Skype for Business logs in successfully.

AFTER RUNNING iptables.sh
Skype for Business disconnects, and fails to re-connect, normal skype works just fine.

I revised: https://support.office.com/en-us/article/Create-DNS-records-at-eNomCentral-for-Office-365-a6626053-a9c8-445b-81ee-eeb6672fae77?ui=en-US&rs=en-US&ad=US#bkmk_verify And added all DNS configurations on enom.

That got rid of the DNS error I was getting to another error saying service is temporarily unavailable.

Any suggestions to why this is happening? Any solutions?

Note: both router and Ubuntu's WAN interface use Google's DNS

Any help is really appreciated as I have been trying to fix this for days!

[cid:2FD1C3AB-E45C-49F0-84AB-0F8AC658BD11 at routerb408e2.com]Piensa en el medio ambiente antes de imprimir este email.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.squid-cache.org/pipermail/squid-users/attachments/20161205/8d0075c0/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Image 5-5-16 at 11.48 AM.jpg
Type: image/jpeg
Size: 4083 bytes
Desc: Image 5-5-16 at 11.48 AM.jpg
URL: <http://lists.squid-cache.org/pipermail/squid-users/attachments/20161205/8d0075c0/attachment-0001.jpg>

More information about the squid-users mailing list