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wcbenyip
New Member
November 25, 2009
Question

Some https website can' t be accessed...

  • November 25, 2009
  • 13 replies
  • 12155 views
Hi, Since last day afternoon, it' s so strange that some staff cannot access to the https website like the e-banking, webmail via https...etc. This case is happened since last afternoon, the one would keep failed to access to the same https website if he found it' s failed since last afternoon, but some other https websites are working properly~ Even the same https website he can' t be accessed to, other staff may able to access.... so it' s not talking about the issues of the https website... I have no idea now... even both of the DNS server and FG are rebooted, the result is the same~ Anyone could help and give some direction? Thanks!!

    13 replies

    billp
    New Member
    November 25, 2009
    Perhaps a clue in this: http://support.fortinet.com/forum/tm.asp?m=56138&p=1&tmode=1&smode=1 Would be interesting if these are related. Bill
    New Contributor III
    November 25, 2009
    My problem disappeared. What about yours?
    wcbenyip
    wcbenyipAuthor
    New Member
    November 25, 2009
    Well... it' s a different story~ Finally found that the e-banking https websites cannot be accessed due to the old IE version... it works now after upgrade the IE6 to IE7... (maybe the bank increased the security level or changed something in the same time?) However, some other https websites are still need to wait for a long long time... most of them are self-signed cert. (i.e. the yahoo mail https url is OK)... may still need some time to monitor the status~~~ On the other hand, I may need to upgrade the firmware version from v402 b099 to the lastest one... as the apps control for the IM is crashed.... no login could be found anymore and even no control...
    New Contributor III
    November 25, 2009
    Nothing to do with the bank changing their settings.... We' ve started to use our 310b for web filtering including ssl inspection and have no end of issues. Sites that were previously accessible via our old proxy no longer work through the FGT using IE6. Go via proxy and all works. Go via FGT and it doesn' t. Like you say though, an upgrade to IE7 seems to fix most sites. What do we do with SSL sites still not working though? Allowing the sites using local ratings doesnt work, adding them as exempt in the URL filter doesnt work. Logs all say allowed/except but still just ' page cannot be displayed' . Nothing in the logs saying anything blocked either. The only workaround i' ve got is to use an fqdn alias for each site and a seperate policy allowing the traffic. Hardly ideal with loads of sites blocked and having to add a policy for every single host that we need to access (which can be many per domain in some cases)
    rwpatterson
    New Member
    November 25, 2009
    Under ' Advanced' in Internet Options, allow TLS 1.0. Works most of the time. Still a pain to visit every workstation.... Just got off the the phone with my SE. He had me turn of the proxy scanning in application control and that seemed to kick it. My Fortiguard is still active. I' ll have to see what other implications arise...
    wcbenyip
    wcbenyipAuthor
    New Member
    November 25, 2009
    Oh..... yes! Thanks for your input, rwpatterson ~ It' s really working now once change the setting of the " Proxy - All application" in the Application Control from BLOCK to ALLOW, any SSL urls are now resumed as normal~~~ But anyone knows why the proxy blocking is related to the SSL url ??? Some SSL url is using the http proxy?
    rwpatterson
    New Member
    December 1, 2009
    I went into the application control log, saw Ultrasurf and Freegate getting through. After I blocked Freegate, the problem came back. :( So it seems to be just Freegate that' s causing it. On the phone now with support. Will keep you updated...
    Daniel_Herbon
    New Member
    December 1, 2009
    Glad I came across this thead. Within the last 5 days two important banking sites that load via https stopped working for us in our main office where I have a 200A. However those same sites work in our office across the street where I have a 80C. Google works fine for me but oddly enough microsoft.com will not load. I' ve also rebooted everything that could possibly be the problem. I even changed out DNS servers to verify it wasn' t a DNS issue. Routers & Switches have also been rebooted. I' ve disabled the WEB protection profile which made no difference. I guess at this point Im going drop in an old ASA5505 in place of the 200A to verify its the 200A. 200A - v4.0,build0185,091020 (MR1 Patch 1) 80C - v4.0,build0178,090820 (MR1)
    rwpatterson
    New Member
    December 1, 2009
    OK, clarification... It seems that the IPS definition delivered on the 21st was the issue. I downgraded to 2.666 and the problem has now been gone for 30 minutes straight. Still monitoring, but if you put in a ticket on this, have them reference my ticket 356455.
    Daniel_Herbon
    New Member
    December 1, 2009
    How did you downgrade? Where did you get the IPS file? Btw, on my two fortigates where everything is working fine, they' re running: 2.00593 The fortigate unit that isn' t working was just updated and is running: 2.00719
    rwpatterson
    New Member
    December 1, 2009
    Support gave me the older file. Don' t let those other 2 update.... FYI: Check here...
    rwpatterson
    New Member
    December 3, 2009
    Reply from support:
    Dear customer, Thank you for these links. This false positive is just triggered on some SSLv3 packets. If your web browser uses TLS protocol, this false positive won' t happen. We' ll fix it in next engine. For now, you have to disable it. Best Regards, Fortinet IPS - Peixue
    Daniel_Herbon
    New Member
    December 3, 2009
    Unfortunately my first experience with Fortinet support isn' t turning out to be a good one. Day 4 of this problem now since it was discovered. I' ve referenced this thread and your ticket several times. I' ve requested a previous definition several times yet the guy working my ticket just doesn' t seem to care. I configured a Cisco ASA5505 with the same incoming/outgoing rules as my 200A. When I plug my network into the ASA5505, everyone in the office can browse without any problems. I plug it back into my 200A those same sites become unaccessible. Hopefully I' ll get a resolution soon or I' ll have to switch back to using Cisco devices.
    rwpatterson
    New Member
    December 3, 2009
    Open up (pass) Freegate proxy in application control, and you should be good to go until the next IPS update.
    rwpatterson
    New Member
    December 4, 2009
    Well, I see a new IPS signature has been uploaded. When I go to the page to check what was changed (a couple of posts before this one) the page is blank. 2.721 still has the false positive issue as far as I can tell. Started getting hits as soon as I updated... ADDED - After 30 minutes, there are far lass false hits than before, so it' s better, just not close to perfect yet... Could just be that traffic is light at 7:00 AM here. ADDED #2 - Seems like old times. Still have the same amount of false positives...
    New Contributor III
    December 18, 2009
    Greetings! Im having some HTTPS issues as well. We have two 110C, in active-active cluster, working in v4.0,build0185,091020 (MR1 Patch 1) firmware version. We are testing a Protection Profile configured with Deep Scan active in HTTPS Content Filtering Mode. We need this feature up because i cant block HTTPS sites (like gmail or orkut, for example) with URL filter or even with Application Control, in some cases when the user is granted to acess Gmail, but not Google Talk. The thing is: when i set Deep Scan active, some HTTPS sites (mostly banking) doesn' t work and MSN users can' t log on. Anybody using Deep Scan who can give me some help?
    rwpatterson
    New Member
    December 18, 2009
    icrema, welcome to the forums. Your issue doesn' t seem to be the exact same one. Try starting a new thread to get better exposure. Daniel What did the application control log tell you? That' s where I found that the Freegate proxy was giving false positives.
    Daniel_Herbon
    New Member
    December 18, 2009
    I was having the exact same issue. My issue was never resolved. As you can see in my posts above, my 200A ran perfectly for 6 months. Then something changed over Thanksgiving break and we started having all sorts of HTTPS sites blocked as well as msn and other various sites. After a week of troubleshooting, my company could no longer afford to be blocked from banking sites so I ended up replacing the 200A with a backup Cisco ASA 5505 and everything works fine. At this point support has instructed me to reset the firewall to factory defaults and reconfigure it back to how it was before Thanksgiving. I haven' t had the time yet to reset it to factory.