If there is, Sophos Firewall has a port mismatch and the traffic is treated as unauthenticated. This happens when the Thin Client user accesses the internet with Internet Explorer. To use a different FQDN or a bare hostname, go to Administration > Admin settings > Admin console and end-user interaction and select Use a different hostname, and enter the hostname you want to use. Sophos Firewall OS v19 MR1 is Now Available: https://community.sophos.com/sophos-xg-firewall/b/blog/posts/sophos-firewall-v19-mr1-is-now-available Thanks & Regards, Therefore, if you configure the Sophos Firewall. Can you also, update me on the other steps I suggested you? Sign in to the Sophos Firewall command line interface. If you're redirecting using a bare hostname, the browser will see that the requester is local and automatically trust it to perform SSO. If that doesn't work for you, then I worry that you will need to consult support to look into it. If you have used an IP address, the client allows only NTLM authentication. Thank you for your feedback. 1) Need to rollback to previous version where CAA agent is working fine. If a post (on a question thread) solves, Sophos Firewall requires membership for participation - click to join. Some common issues for authentication failure are: Configuration errors, domain join failures, and in the case of Kerberos the key version number (KVNO) not matching between endpoints and Sophos Firewall. Follow the steps in Sophos Firewall: Install and configure Sophos General Authentication Client for macOS. Now the recipient of the email replied to me with a certificate issued by COMODO RSA Client Authentication and . So either the site requesting them must be a bare hostname (without the domain, for example, myfirewall), or the browser must trust the requesting site. Help us improve this page by, How to deploy Sophos Firewall on Amazon Web Services (AWS), Control traffic requiring web proxy filtering, Add a DNAT rule with server access assistant, UDP time-out value causes VoIP calls to drop or have poor quality, VoIP call issues over site-to-site VPN or with IPS configured, Audio and video calls are dropping or only work one way when H.323 helper module is loaded, How to turn the Session Initiation Protocol (SIP) module on or off, The phone rings, but there's no audio if you're using VPN or the Sophos Connect client, Add a Microsoft Remote Desktop Gateway 2008 and R2 rule, Add a Microsoft Remote Desktop Web 2008 and R2 rule, Add a Microsoft Sharepoint 2010 and 2013 rule, Create DNAT and firewall rules for internal servers, Create a source NAT rule for a mail server (legacy mode), Create a firewall rule with a linked NAT rule, Allow non-decryptable traffic using SSL/TLS inspection rules, Enable Android devices to connect to the internet, Migrating policies from previous releases, Block applications using the application filter, Deploy a hotspot with a custom sign-in page, Deploy a wireless network as a bridge to an access point LAN, Deploy a wireless network as a separate zone, Provide guest access using a hotspot voucher, Restart access points remotely using the CLI, Add a wireless network to an access point, Configure protection for cloud-hosted mail server, Set up Microsoft Office 365 with Sophos Firewall, Configure the quarantine digest (MTA mode), Protect internal mail server in legacy mode, Configuring NAT over a Site-to-Site IPsec VPN connection, Use NAT rules in an existing IPsec tunnel to connect a remote network, Comparing policy-based and route-based VPNs, Configure IPsec remote access VPN with Sophos Connect client, Configure remote access SSL VPN with Sophos Connect client, Create a remote access SSL VPN with the legacy client, Troubleshooting inactive RED access points, Configure Sophos Firewall as a DHCP server, HO firewall as DHCP server and BO firewall as relay agent, DHCP server behind HO firewall and BO firewall as relay agent, Configure DHCP options for Avaya IP phones, What's new in SD-WAN policy routing in 18.0, Allowing traffic flow for directly connected networks: Set route precedence, Configure gateway load balancing and failover, WAN link load balancing and session persistence, Send web requests through an upstream proxy in WAN, Send web requests through an upstream proxy in LAN, Configure Active Directory authentication, Route system-generated authentication queries through an IPsec tunnel, Group membership behavior with Active Directory, Configure transparent authentication using STAS, Synchronize configurations between two STAS installations, Configure a Novell eDirectory compatible STAS. Enter a Hostname. If it's a DNS FQDN, it must match the DNS SPN that you created manually. Could youverify that all the details are filled in the "Default" certificate authority in System | Certificate | Certificate Authority | Default? Is the only solution to upgrade to v19-MR1? To use a different FQDN or a bare hostname, go to Administration > Admin settings > Admin console and end-user interaction, select Use a different hostname, and enter the hostname you want to use. Go to, If you need to install a new certificate that covers the hostname of Sophos Firewall, you can do this under the Certificates menu. Due to the above limitation, the proxy server cannot be configured for the Distribution Server, if the client certificate authentication is . I updated to verison 19.0.0 GA-Build317 back in April and didn't have any issues until today. Click Actions > All Tasks > Import. If that doesn't help then, Regenerate Default CA and do not use the apostrophe in any fields. The default configuration is for the Sophos Firewall to redirect the proxy to a URL containing the IP. Browsers will only automatically perform Kerberos login (single sign-on) if they're sure that the site requesting credentials is part of the Kerberos domain. To add a certificate from a website to the custom certificate list, see "Adding a Certificate from a Web Site". If you're redirecting using a bare hostname, the browser will see that the requester is local and automatically trust it to perform SSO. If the terminal server is not shown in the above steps, add it using the following command: system auth thin-client add citrix-ip IPADDRESS. The Device also supports Single Sign On (SSO) for transparent authentication, whereby Windows credentials can be used to authenticate and a user has to sign in only once to access network resources. This usually can occur when trying to decommission a Dc server used for AUTH in Sophos XG. You must change this to use either a bare hostname or an FQDN. Are there any differences between this one laptop and the other computers in terms of permissions or rights? Do you install the SAA with the .msi or the .exe file ? Make sure the endpoint computer can resolve the Sophos Firewall by the method you select. Thin Client (SATC) users can't sign in NTLM and Kerberos troubleshooting Endpoint computer can't authenticate via NTLM due to the redirection URL When attempting to authenticate via Active Directory SSO using Kerberos with the HTTP proxy in transparent mode, the Kerberos authentication fails. On the Exchange Server, client device certificate authentication must remain turned off. If apost solvesyourquestion please use the'Verify Answer' button. Configure a hostname on Sophos Firewall. I think you have to install the certificate .pem along with the client authentication agent. Download MSI: Downloads the Client Authentication MSIpackage. Are you installing with administrative rights on this one computer? To use a different FQDN or a bare hostname, go to Administration > Admin settings > Admin console and end-user interaction and select Use a different hostname, and enter the hostname you want to use. If the connection is successful, continue the steps below. Hello Paul Norris1,Thank you for reaching out to the community,based on the reported issue as it was working fine previously, it seemsXG is sending the CA certificate with the future date stored under /conf/certificate/internalcas/ClientAuthentication_CA.der. As SATC sends the username over port 6060, users don't appear in the live user list. 5. Reason: Source server 'NT AUTHORITY\SYSTEM' does not have token serialization permission. Verify that all the details are filled in the "Default" certificate authority in System | Certificate | Certificate Authority | Default? I noticed when I installed SAA on other computers, it included a certificate import that is NOT happening on this laptop (SAA works on all the other computers I've tried thus far). Sign into your account, take a tour, or start a trial from here. SATC supports only TCP connections, not UDP connections. Also, check that the service is running in the Windows task manager. Troubleshoot common Kerberos and NTLM issues. If your DNS and Active Directory use different domain names (such as mycompany.com and mycompany.local), and you want to use the DNS name in redirection, you must manually create the SPN on your AD domain controller. Go to Administration > Admin settings > Hostname. The requesting site, in this case, Sophos Firewall, must be using a hostname or FQDN for redirection that matches the service principal name (SPN) of the firewall on the Active Directory (AD) server. Once the connection is established and the user is recognised, the device can be used for browsing through the Internet, according to the current user policy set up by the administrator. For example, myfirewall.mycompany.com. When users sign in to it, they're signed directly into the network. If UAC is enabled, it doesn't allow the SATC client to send the traffic to Sophos Firewall. Sophos Network Agent allows a local network user to authenticate himself/herself to the Sophos XG Firewall (SFOS) with an iOS device. I have the same problem. Follow the steps below to check that your systems are configured correctly and correct any issues you find. Client Authentication Agent could not validate the certificate JanVan Der Nest over 6 years ago Hi All, I'm trying to setup the CAA to client pc's, however, when i run CAA it comes up with a message, "Could not validate the certificate, CAA will now close" Please assist. See the troubleshooting topic for the authentication method you use. For many customers, the domain name used in DNS and Active Directory is the same, which means that the DNS FQDN and the Active directory computer name are the same. Configure a hostname on Sophos Firewall. Browsers will only automatically send login credentials (single sign-on) if they're sure that the site requesting them is local. If UAC is enabled, it doesn't allow the SATC client to send the traffic to Sophos Firewall. Under Admin console and end-user interaction > Certificate, select the certificate to use from the drop-down menu. Sophos Firewall OS v19 MR1 is Now Available:https://community.sophos.com/sophos-xg-firewall/b/blog/posts/sophos-firewall-v19-mr1-is-now-available, Thanks & Regards,_______________________________________________________________, Vivek Jagad| Technical Account Manager 3 | Cyber Security Evolved. The browser displays a pop-up asking for credentials or directs users to the captive portal. The requesting site, in this case, Sophos Firewall, must be using a hostname or FQDN for redirection that matches the service principal name (SPN) of the firewall on the Active Directory (AD) server. Sophos Network Agent enables Sophos Firewall to authenticate local network users using mobile devices running iOS 13 and later. "Sophos Partner: Infrassist Technologies Pvt Ltd". Configure a hostname on Sophos Firewall. ; To remove a certificate from the custom certificate list, select the check box to the right of the certificate in the custom certificate list that you want to remove, click . The installation with the firmware v19-mr0 runs since the 1st of july 2022 without the certificate error. If the terminal server is not shown in the above steps, add it using the following command: system auth thin-client add citrix-ip IPADDRESS. This can be the configured FQDN, a different FQDN (such as the AD computername), or a bare hostname. Client Authentication Agent could not validate the certificate, Remember to like a post. To troubleshoot authentication, you will typically need access to both Sophos Firewall and the authentication server as well as a client device that is failing authentication. Go to Administration > Admin settings > Hostname. If the connection is successful, continue the steps below. Alternatively, to manually add the FQDN to a browser, follow the steps below. You can either distribute the SAA manually or have your users download the client from the User Portal. This does not require a client on the user's machine. Client devices fail authentication when Kerberos and NTLM are configured. No difference. TryGetCommonAccessToken (HttpContext httpContext, Stopwatch stopwatch, CommonAccessToken& token) at Microsoft.Exchange.Security.Authentication.BackendRehydrationModule. You must use a fully qualified domain name (FQDN) that matches your company domain. Anyone has a solution or an idea? If you have used an IP address, the client allows only NTLM authentication. I am running version 8.0.4-5 of the UID agent. Be advised that these instructions could cause harm to the . Allow clientless SSO (STAS) authentication over a VPN. For Windows Download the CAA installer on the computer of the user. As a result, the browser falls back to using NTLM or the captive portal for authentication. I verified the time on our AD server, our client PCs, and XG firewall and all was correct. SAA will now close. 2. For more information, see, To use the configured FQDN of Sophos Firewall, go to, One SPN is created for the bare hostname. All the details were filled in the default certificate. This issue is normally caused when the hostname of Sophos Firewall is changed. For example, myfirewall.mycompany.com. If you use Internet Explorer, do the following to disable Enhanced Protected Mode. In another thread that has not yet been restored at astaro.org: https://www.astaro.org/gateway-products/web-protection-web-filtering-application-visibility-control/55187-could-not-validate-certificate-saa-will-now-close.html, "I have found a few posts similar with this error message but non of them seem to help.I installed the Sophos Agent on my local machine (Win 8) and entered my Active Directory credentials, this worked a treat and web filtering was working as expected.I then restarted the machine and logged back on with the same credentials and I get the error:Could not validate certificate! Alternatively, to manually add the FQDN to a browser, follow the steps below. SecureAuth Knowledge Base Articles provide information based on specific use cases and may not apply to all appliances or configurations. Click the toggle switch. Customized Virtual directory authentication settings - There could be change in Authentication settings. I tried all options you suggested and still no luck. Go to Download client > Authentication clients and click Download certificate for iOS 12 and earlier and Android to download the authentication server CA certificate. Sachin Gurung Team Lead | Sophos Technical Support Knowledge Base|@SophosSupport|Video tutorials Remember to like a post. Download EXE: Downloads the Client Authentication program including the CA certificate for direct installation on client PCs. 1) Need to rollback to previous version where CAA agent is working fine. Nothing seems to be fixing it. I have tried manually installing various CA certificates from the UTM, but I still apparently haven't found the right one. There is a bug with CAA and the solution is to regenerate the appliance CA and reinstall the client. To remove browser warnings about certificates, the certificate must cover the hostname or FQDN that traffic is redirected to. Yes, BIOS time was off by an hour due to clock changes, corrected and it's now working again. Users of terminal servers such as Citrix must use a thin client (SATC) to sign in. Thanks for the update. What do I need to do to get the right certificate on this laptop? Terminal server users are unable to authenticate. When attempting to authenticate via Active Directory SSO using NTLM with the HTTP proxy in transparent mode, the NTLM authentication fails. The issue is reported in the bug IDNC-8138. at Microsoft.Exchange.Security.Authentication.BackendRehydrationModule. When you're redirecting to perform AD SSO, the browser attempts to match an SPN and must trust it to perform Kerberos authentication. The certificate can be downloaded from the UTM, the link is at the bottom of the page where you found the client msi file (definitions & user > client authentification). 3. Browsers will only automatically send login credentials (single sign-on) if they're sure that the site requesting them is local. The client must establish two TLS connections with Sophos Firewall. SAA will now close" please post a solution! When attempting to authenticate via Active Directory SSO using NTLM with the HTTP proxy in transparent mode, the NTLM authentication fails. This issue is normally caused when the hostname of Sophos Firewall is changed. Alongside, make sure MAC binding is not defined for the User definition, who is trying to authenticate from the client. The default configuration is for the Sophos Firewall to redirect the proxy to a URL containing the IP. User authentication can be performed using a local database, Active Directory, LDAP, RADIUS, TACACS, eDirectory, NTLM or a combination of these. Click the Client certificate-based security radio button so it's enabled. Make sure you understand and are ready to upgrade. To configure MFA for users other than the default admin account, do as follows: Under One-time password (OTP), select if you want to turn on MFA for All users or Specific users and groups. Follow the steps below to check that your systems are configured correctly and correct any issues you find. If it's a bare hostname, it must match the bare hostname SPN that was created automatically. We too all of a sudden started having could not validate certificate errors with our CAA. Configure the user inactivity timer for STAS, Check connectivity between an endpoint device and authentication server using STAS, Migrate to another authenticator application, Use Sophos Network Agent for iOS 13 devices, Use Sophos Network Agent for iOS 12 and Android devices, Sophos Authentication for Thin Client (SATC), Set up SATC with Sophos Server Protection, Sophos Firewall and third-party authenticators, Couldn't register Sophos Firewall for RED services, Configure a secure connection to a syslog server using an external certificate, Configure a secure connection to a syslog server using a locally-signed certificate from Sophos Firewall, Guarantee bandwidth for an application category, How to enable Sophos Central management of your Sophos Firewall, Synchronized Application Control overview, Reset your admin password from web admin console, Download firmware from Sophos Licensing Portal, Troubleshooting: Couldn't upload new firmware, Install a subordinate certificate authority (CA) for HTTPS inspection, Use Sophos Mobile to enable mobile devices to trust CA for HTTPS decryption, https://docs.sophos.com/nsg/sophos-firewall/latest/Help/en-us/webhelp/onlinehelp/. SAA will now closeTried uninstalling / reinstalling etc but the error remains.Any help please.". If you have configured Sophos Firewall as an explicit proxy, make sure the hostname has been used in the browser settings. If you're only configuring MFA for specific users and groups, click Add users and groups, select the users and . Set the proxy redirection URL. You must use a fully qualified domain name (FQDN) that matches your company domain. Introduction Sophos Network Agent is an authentication client. If you're redirecting using an FQDN, configure your browser to trust the FQDN of Sophos Firewall using AD Group Policy. When the Sophos Firewall joins the AD Domain, it's given an AD computername, and two SPN entries are automatically created. As a result, the browser falls back to using NTLM or the captive portal for authentication. Fill up the details and re-download the client for a fresh installation. To troubleshoot authentication, you will typically need access to both Sophos Firewall and the authentication server as well as a client device that is failing authentication. If you use Internet Explorer, do the following to minimize or disable User Account Control (UAC): User Account Control is a security component that allows an administrator to enter credentials during a non-administrator's session to perform administrative tasks. See the troubleshooting topic for the authentication method you use. Whatever you use must match an SPN. SATC LSP registers with Winsock for Sophos Firewall to understand the user traffic. Management, Networking, Logging and Reporting, Could not validate certificate! The certificate can be one that has been purchased from a public certificate authority and is automatically trusted by all clients. Therefore, if you configure the Sophos Firewall. How to investigate and resolve common authentication issues. This article shows how Certificate Authentication can be implemented in ASP.NET Core 3.1. Make sure that the client computer can reach the domain controller over the infrastructure tunnel. Whatever you use must match an SPN. If you are using HTTPS scanning this will impact and give you certificate error to resolve re install Sophos SSL CA again on end system/s as per the below link : XG Firewall CAA "Could not validate certificate! If you use Google Chrome, do the following to update Runs network service in-process settings: Users will be able to authenticate via SATC as expected.*. Thank you for your feedback. Sophos Community | Product Documentation | Sophos Techvids | SMSIf a post solves your question please use the 'Verify Answer' button. If you want to save authentication and decryption results, select the choices you want. Select a certificate that browsers will automatically trust. Click on your AD server and then click Test connection. I went away over the weekend and on login on Monday I now get the following error and the CAA exits, nothing should have changed from when it was last working on Friday. Replace IPADDRESS with the IP addresses of the server. To enable client certificate-based security 1. ; To add a certificate authority to the custom certificate list, see "Adding a Root Authority Certificate". Sign in to the Sophos Firewall command-line console. Authentication server could not be deleted. Download CA: Downloads the CA certificate that has to be rolled out in addition to the MSIpackage. On all terminal servers running SATC, open SATC, go to the Sophos Settings tab and verify that the correct IP address is configured for Sophos Firewall under Sophos IP Address. You must change this to use either a bare hostname or an FQDN. 2) Make sure that time is correctly set on the appliance in that firmware version. Select a certificate that browsers will automatically trust. 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