Analyzing the raw data (by clicking in "Raw data" button at the top right of page), we can see that the OCSP GET Request for subordinate CA contains special characters (two '+' symbols) that should be encoded properly (URL encoding).
I attach copy&paste raw data of OCSP request (PEM encoded): -----BEGIN OCSP REQUEST----- MEIwQDA+MDwwOjAJBgUrDgMCGgUABBS634rj9+tQjJTBuuMefNw6cT1ENwQUFBHi tSu5jJitaNMxVEDkWF8DG30CAQI= -----END OCSP REQUEST----- -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to thunderbird in Ubuntu. https://bugs.launchpad.net/bugs/1271513 Title: www.cert.fnmt.es certificates are not included in Mozilla products Status in Mozilla Firefox: Fix Released Status in Mozilla Thunderbird: Fix Released Status in firefox package in Ubuntu: Fix Released Status in thunderbird package in Ubuntu: Fix Released Bug description: Please add <www.cert.fnmt.es> (National Coin and Ding Factory of Spain) as a valid certification authority in the default Firefox installation. ProblemType: Bug DistroRelease: Ubuntu 13.10 Package: firefox 26.0+build2-0ubuntu0.13.10.2 ProcVersionSignature: Ubuntu 3.11.0-14.21-generic 3.11.7 Uname: Linux 3.11.0-14-generic x86_64 AddonCompatCheckDisabled: False ApportVersion: 2.12.5-0ubuntu2.2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC2: es20490446e 2130 F.... pulseaudio /dev/snd/controlC1: es20490446e 2130 F.... pulseaudio /dev/snd/controlC0: es20490446e 2130 F.... pulseaudio BuildID: 20131206145143 Channel: Unavailable Date: Wed Jan 22 12:49:53 2014 Extensions: extensions.sqlite corrupt or missing ForcedLayersAccel: False IfupdownConfig: # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite) InstallationDate: Installed on 2013-05-21 (245 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424) IpRoute: default via 192.168.2.1 dev eth0 proto static 192.168.2.0/24 dev eth0 proto kernel scope link src 192.168.2.117 metric 1 IwConfig: eth0 no wireless extensions. lo no wireless extensions. Locales: extensions.sqlite corrupt or missing MarkForUpload: True PrefSources: prefs.js Profiles: Profile0 (Default) - LastVersion=26.0/20131206145143 (In use) RelatedPackageVersions: google-talkplugin 4.9.1.0-1 icedtea-7-plugin 1.4-3ubuntu2 totem-mozilla 3.8.2-0ubuntu1 rhythmbox-mozilla 2.99.1-0ubuntu1 RfKill: RunningIncompatibleAddons: False SourcePackage: firefox Themes: extensions.sqlite corrupt or missing UpgradeStatus: Upgraded to saucy on 2013-10-18 (96 days ago) WifiSyslog: dmi.bios.date: 02/18/2008 dmi.bios.vendor: Phoenix Technologies, LTD dmi.bios.version: 6.00 PG dmi.board.name: MS-7358 dmi.board.vendor: MICRO-STAR INTERNATIONAL CO., LTD dmi.board.version: Fab D dmi.chassis.type: 3 dmi.chassis.vendor: OEM dmi.chassis.version: OEM dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvr6.00PG:bd02/18/2008:svnMEDIONPC:pnMS-7358:pvrOEM:rvnMICRO-STARINTERNATIONALCO.,LTD:rnMS-7358:rvrFabD:cvnOEM:ct3:cvrOEM: dmi.product.name: MS-7358 dmi.product.version: OEM dmi.sys.vendor: MEDIONPC To manage notifications about this bug go to: https://bugs.launchpad.net/firefox/+bug/1271513/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp