Hello everyone from Russia!
There was no solution on the Russian forums. I hope for the experience of my English-speaking colleagues.
I have a network of mikrotiks connected by a VPN. 192.168.70.1 - IPsec VPN server configured on router 0.1. In the first subnet, along with the 192.168.1.1 router, there is hAP ac2 configured as a bridge CAP and receiving ip 192.168.1.2.
TheDude server version 6.49.1 is configured on the 192.168.1.2 router. TheDude works great: all devices on the local network are added to the map and monitored by snmp.
But in all routers on other subnets, entries constantly appear in the logs: "login failure for user admin from 192.168.70.1 via winbox". There are no authorization errors on mikrotik 192.168.1.1.
In this case, on all routers in the device settings window, the "Status: up", "RouterOS Status: ok". If I press "Reconnect", there will be a successful authorization in the logs, and after a while - again logs with the same error. If I disable TheDude, no new entries appear.
The problem is not in the firewall because it is allowed to connect to each device via winbox from the local network 192.168.0.0/16. I repeat: everything is fine in the local router 192.168.1.1, but errors in the routers of other subnets.
Hope for help. Thanks.