Hi,
I joined a Ubuntu 20.04 server to a Windows domain, but I am stuck with the following errors in the /var/log/sssd_domain.log file: (Tue Apr 13 15:07:38 2021) [sssd[be[my_domain]]] [resolv_gethostbyname_done] (0x0040): querying hosts database failed [5]: Input/output error (Tue Apr 13 15:07:38 2021) [sssd[be[my_domain]]] [nsupdate_get_addrs_done] (0x0040): Could not resolve address for this machine, error [5]: Input/output error, resolver returned: [11]: Could not contact DNS servers (Tue Apr 13 15:07:38 2021) [sssd[be[my_domain]]] [nsupdate_get_addrs_done] (0x0040): nsupdate_get_addrs_done failed: [5]: [Input/output error] (Tue Apr 13 15:07:38 2021) [sssd[be[my_domain]]] [sdap_dyndns_dns_addrs_done] (0x0040): Could not receive list of current addresses [5]: Input/output error (Tue Apr 13 15:07:38 2021) [sssd[be[my_domain]]] [ad_dyndns_sdap_update_done] (0x0040): Dynamic DNS update failed [5]: Input/output error (Tue Apr 13 15:07:38 2021) [sssd[be[my_domain]]] [be_ptask_done] (0x0040): Task [Dyndns update]: failed with [5]: Input/output error (Tue Apr 13 15:07:38 2021) [sssd[be[my_domain]]] [sdap_sudo_load_sudoers_done] (0x0040): Received 0 sudo rules
I checked the outputs of 'hostname' and 'hostname --fqdn' and they are correct. 'nslookup' resolves correctly the name of any other Windows server within the domain.