Update debug: server-side tests pass, may be client caching

docs/incidents/2026-01-25-adblock-debug-in-progress.md

@@ -47,3 +47,23 @@ Sync copies config from MikroTik → Unraid
 ---
 
 *Debug session paused - device connectivity issue reported*
+
+## Debug Session 2 (13:55)
+
+### Findings
+- AdGuard IS receiving queries from clients (192.168.31.100, .134, .101, etc.)
+- AdGuard IS responding (Elapsed times logged)
+- MikroTik DNS working (resolve commands succeed)
+- Internet reachable from Unraid (ping google.com works)
+- Connectivity check URLs all return proper status codes
+- Masquerade rules have packet counts (traffic flowing)
+- No connectivity domains being blocked
+
+### Status
+All server-side tests pass. Issue may be:
+1. Client-side caching of old DNS
+2. Device needs reconnect after all the changes
+3. Specific device issue
+
+### Recommendation
+Have user disconnect/reconnect device to get fresh DHCP lease and DNS.