Enable FIPS Mode on SLES 15 and Verify the Boot State
Follow SUSE’s SP7 procedure to enable FIPS mode, reboot safely, verify the active policy, and check whether your compliance requirement calls for validated modules.
Although not as popular and used as Zalo , Viber or Skype , Tango is also one of the OTTs that has had a fairly strong development time in Vietnam, and the number of people still loyal to messaging. This free calling is also still quite large.
It is also very uncommon for cases to solve, the troubleshooting of Tango errors is also very rare, which makes people who are still in the habit of using this free calling application encounter. less difficult.

Expression: Cannot click like for other people's photos, nor can they send messages to them. If you click on the image you want to like, the message Can't Not Like will appear .
Solution: With this error, the big possibility is that the Tango version you are using is too old, or not updated to the latest version. So just need to update to a newer version, or if that doesn't work, you can completely remove the currently used Tango and reinstall the latest version.
Another Tango bug related to version updates is that when making a video call, the recipient of the call will not be able to see the image of the caller, or vice versa. With this initial expression, you only need to check the Internet connection or Wifi signal of the device that is using Tango, because it is likely due to a bad connection, unstable, poor signal that makes the connection Error image.
It is quite annoying that Tango is very sensitive to the flickering signals caused by the Internet. If you can still send messages, still make outgoing calls normally, only incoming calls will not be acceptable, please check your personal information and ensure it is secure. Your account has been correctly verified. Or make sure the Internet signal source from both callers and recipients is stable and strong enough to make a smooth call.
This is a fairly simple error but also quite a lot of people make it. Specifically, when making a call and starting a conversation, you do not hear any sound, or the sound is very small and hard to hear.
Solution: Try connecting the device to the headset and make a call again to check if the external accessory is used, does the error still occur? Or maybe try to quit Tango, reset the device, then access again and make a call, maybe your Tango is temporarily having a conflict with a utility or an application.
Personal information is extremely necessary to ensure the authentication of user accounts, as well as recover passwords, or use to make friends, chat during the use of Tango in particular and utilities. , other general applications. If you cannot confirm your email account or phone number, it means that you accept to use Tango with a fairly high security risk.
Solution: Log in to Tango , select Profile Settings. Here, you correct the incorrect information as well as add other missing information.
In order to fix this error, first of all, you need to make sure their saved information is the same information that they have declared on Tango. Because Tango can sync contacts on the phone with its own contacts, so if your friends or someone else isn't on the phone book, you can do the following:
This is a fairly common mistake when Tango users say that their calls are made from the numbers in the phone book, but cannot be successful. To explain and overcome this situation, once again we need to consider the connection of the Internet connection as well as the version of Tango being used. Or it could be that you or the other user have changed access to your Tango account on different devices, making the connection unsuccessful!
In addition, with other errors that display an error message, you can see exactly what the error is, due to the cause of the problem so that it can be fixed directly. Like problems connecting to a wireless network, trying another network, or reviewing the security settings on the device. If necessary, you can try removing the current version and reinstalling another version.
Hopefully, with the above instructions, you will feel less embarrassed and easily solve errors that occur during the use of free messaging and phone call - Tango.
Follow SUSE’s SP7 procedure to enable FIPS mode, reboot safely, verify the active policy, and check whether your compliance requirement calls for validated modules.
Compare YaST and cryptsetup for a new encrypted SLES data volume, choose LUKS1 or LUKS2, and verify unlock and mount behavior safely.
Create, refine, and verify a least-privilege AppArmor profile on SLES 15 SP7, with a clear note on SLES 16’s SELinux default.
Set up RMT on SLES 15, mirror entitled repositories, and verify HTTPS registration and package access from a test client.
Connect SLES 15 to AD with YaST’s SSSD-based logon management, then verify directory lookup, domain login, and Kerberos tickets.
Set up the right Live Patching path for SLES 16.0 or 15 SP7, apply eligible kernel fixes, and confirm what is active without confusing it with a reboot-required kernel update.
Load a custom SLES 15 kernel module without disabling Secure Boot. Match the running kernel, sign the .ko file, enroll a MOK key, and verify loading.
SLES 15 SP5 can migrate online to SP6, but each node must reboot. Use a tested rolling upgrade or blue-green cutover to keep workloads reachable.
Use SUSE’s supported STIG profile to scan SLES 15, test remediation, review remaining findings, and retain assessment evidence.
Trace a failed Cockpit connection through DNS, port 9090, the systemd socket, firewalld, TLS, and login settings using current SUSE guidance.