I started having problems connecting to internal company resources after the last OS update. The system is not resolving internal servers names. Here are my diagnostics:
~ nslookup gitl.ym-dev.tech
;; communications error to 192.168.199.81#53: timed out
;; communications error to 192.168.199.81#53: timed out
;; communications error to 192.168.199.81#53: timed out
;; communications error to 192.168.199.82#53: timed out
Server: 1.1.1.1
Address: 1.1.1.1#53
Non-authoritative answer:
Name: gitl.ym-dev.tech
Address: 28.202.85.11
### The internal ip-address of gitl.ym-dev.tech is 192.168.199.54
~ telnet 192.168.199.81 53 20s
Trying 192.168.199.81...
Connected to 192.168.199.81.
Escape character is '^]'.
^]
telnet> quit
Connection closed.
~ telnet 192.168.199.82 53 6s
Trying 192.168.199.82...
Connected to 192.168.199.82.
Escape character is '^]'.
^]
telnet> quit
Connection closed.
~ cat /etc/resolv.conf
# Generated by NetworkManager
search wt.net wb.com
nameserver 192.168.199.81
nameserver 192.168.199.82
nameserver 1.1.1.1
# NOTE: the libc resolver may not support more than 3 nameservers.
# The nameservers listed below may not be recognized.
nameserver 8.8.8.8
~ routel 3s
Dst Gateway Prefsrc Protocol Scope Dev Table
default 192.168.71.1 192.168.71.252 dhcp wlp9s0
10.9.1.1 10.9.1.249 static tun0
10.9.1.249 10.9.1.250 kernel link tun0
10.10.0.0/16 10.9.1.249 static tun0
10.11.0.0/16 10.9.1.249 static tun0
10.12.0.0/16 10.9.1.249 static tun0
10.13.0.0/16 10.9.1.249 static tun0
10.14.0.0/16 10.9.1.249 static tun0
10.15.0.0/16 10.9.1.249 static tun0
10.38.78.0/24 10.9.1.249 static tun0
10.60.147.0/24 10.9.1.249 static tun0
10.70.68.0/24 10.9.1.249 static tun0
10.99.90.0/24 10.9.1.249 static tun0
10.104.14.0/24 10.9.1.249 static tun0
10.169.217.0/24 10.9.1.249 static tun0
10.176.104.0/24 10.9.1.249 static tun0
10.178.210.0/24 10.9.1.249 static tun0
28.202.85.43 192.168.71.1 static wlp9s0
192.168.71.0/24 192.168.71.252 kernel link wlp9s0
192.168.71.1 static link wlp9s0
192.168.198.0/24 10.9.1.249 static tun0
192.168.199.0/24 10.9.1.249 static tun0
10.9.1.250 10.9.1.250 kernel host tun0 local
127.0.0.0/8 127.0.0.1 kernel host lo local
127.0.0.1 127.0.0.1 kernel host lo local
127.255.255.255 127.0.0.1 kernel link lo local
192.168.71.252 192.168.71.252 kernel host wlp9s0 local
192.168.71.255 192.168.71.252 kernel link wlp9s0 local
Before the update, everything was working fine.
No changes were made by me or the vpn-gateway admins.