I stop the Kastelo service, also a reboot of server was needed. Now SynoComm package runs alone. I run
root@Synology:~# STTRACE=db /var/packages/syncthing/target/bin/syncthing 2>&1 | tee /volume1/PublicSharings/SyncthingExchange/Syncthing_log_Synology_DS1815.log
[start] 2020/02/26 10:19:16.917695 main.go:548: INFO: syncthing v1.4.0-rc.7 “Fermium Flea” (go1.13.8 linux-amd64) teamcity@build.syncthing.net 2020-02-22 16:49:23 UTC
[start] 2020/02/26 10:19:17.978864 main.go:621: INFO: Automatic upgrade is always enabled for candidate releases.
[FBDWL] 2020/02/26 10:19:17.979177 syncthing.go:151: INFO: My ID: FBDWLxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
[FBDWL] 2020/02/26 10:19:19.004630 sha256.go:87: INFO: Single thread SHA256 performance is 90 MB/s using minio/sha256-simd (66 MB/s using crypto/sha256).
[FBDWL] 2020/02/26 10:19:20.028751 syncthing.go:183: INFO: Hashing performance is 79.84 MB/s
[FBDWL] 2020/02/26 10:19:20.029012 model.go:273: INFO: Starting deadlock detector with 20m0s timeout
[FBDWL] 2020/02/26 10:19:20.029521 limiter.go:165: INFO: Overall send rate is unlimited, receive rate is unlimited
[FBDWL] 2020/02/26 10:19:20.030740 syncthing.go:271: INFO: Using discovery server https://discovery.syncthing.net
/v2/?noannounce&id=LYXKCxxxxxxxxxxxxxxxxxxxxxxxxxxxx
[FBDWL] 2020/02/26 10:19:20.030886 syncthing.go:271: INFO: Using discovery server https://discovery-v4.syncthing.net/v2/?nolookup&id=LYXKCxxxxxxxxxxxxxxxxxxxxxxxxxxxx
[FBDWL] 2020/02/26 10:19:20.030956 syncthing.go:271: INFO: Using discovery server https://discovery-v6.syncthing.net/v2/?nolookup&id=LYXKCxxxxxxxxxxxxxxxxxxxxxxxxxxxx
[FBDWL] 2020/02/26 10:19:20.031200 syncthing.go:305: INFO: Anonymous usage reporting is always enabled for candidate releases.
[FBDWL] 2020/02/26 10:19:20.031909 tcp_listen.go:55: INFO: Listen (BEP/tcp): listen tcp 0.0.0.0:22000: bind: address already in use
[FBDWL] 2020/02/26 10:19:20.032080 service.go:139: INFO: c.S.listenerSupervisor: Failed service ‘tcp://0.0.0.0:22000’ (1.000000 failures of 2.000000), restarting: true, error: “{tcp://0.0.0.0:22000 tcp://0.0.0.0:22000} returned unexpectedly”, stacktrace: [unknown stack trace]
[FBDWL] 2020/02/26 10:19:20.032220 tcp_listen.go:55: INFO: Listen (BEP/tcp): listen tcp 0.0.0.0:22000: bind: address already in use
[FBDWL] 2020/02/26 10:19:20.032267 service.go:139: INFO: c.S.listenerSupervisor: Failed service ‘tcp://0.0.0.0:22000’ (1.999995 failures of 2.000000), restarting: true, error: “{tcp://0.0.0.0:22000 tcp://0.0.0.0:22000} returned unexpectedly”, stacktrace: [unknown stack trace]
[FBDWL] 2020/02/26 10:19:20.032340 tcp_listen.go:55: INFO: Listen (BEP/tcp): listen tcp 0.0.0.0:22000: bind: address already in use
[FBDWL] 2020/02/26 10:19:20.032367 service.go:165: INFO: Entering the backoff state.
[FBDWL] 2020/02/26 10:19:20.032425 service.go:139: INFO: c.S.listenerSupervisor: Failed service ‘tcp://0.0.0.0:22000’ (2.999990 failures of 2.000000), restarting: false, error: “{tcp://0.0.0.0:22000 tcp://0.0.0.0:22000} returned unexpectedly”, stacktrace: [unknown stack trace]
[FBDWL] 2020/02/26 10:19:20.032554 relay_listen.go:62: INFO: Relay listener (dynamic+https://relays.syncthing.net/endpoint) starting
[FBDWL] 2020/02/26 10:19:20.033308 quic_listen.go:86: INFO: Listen (BEP/quic): listen udp 0.0.0.0:22000: bind: address already in use
[FBDWL] 2020/02/26 10:19:20.033373 service.go:165: INFO: Entering the backoff state.
[FBDWL] 2020/02/26 10:19:20.033417 service.go:139: INFO: c.S.listenerSupervisor: Failed service ‘quic://0.0.0.0:22000’ (3.999920 failures of 2.000000), restarting: false, error: “{quic://0.0.0.0:22000 quic://0.0.0.0:22000} returned unexpectedly”, stacktrace: [unknown stack trace]
[FBDWL] 2020/02/26 10:19:20.073173 model.go:371: INFO: Ready to synchronize “Default Folder” (default) (sendreceive)
[FBDWL] 2020/02/26 10:19:20.074836 set.go:303: DEBUG: default WithPrefixedHaveTruncated(7777777-777777N-7777777-777777N-7777777-777777N-7777777-77777Q4, “”)
[FBDWL] 2020/02/26 10:19:20.075310 folder.go:593: INFO: Completed initial scan of sendreceive folder “Default Folder” (default)
[FBDWL] 2020/02/26 10:19:20.075589 set.go:266: DEBUG: default WithNeed(7777777-777777N-7777777-777777N-7777777-777777N-7777777-77777Q4)
[FBDWL] 2020/02/26 10:19:20.136138 api.go:360: INFO: GUI and API listening on 127.0.0.1:54347
[FBDWL] 2020/02/26 10:19:20.136398 api.go:361: INFO: Access the GUI via the following URL: http://127.0.0.1:54347/
[FBDWL] 2020/02/26 10:19:20.136671 syncthing.go:332: INFO: My name is “Synology”
[FBDWL] 2020/02/26 10:19:20.136713 syncthing.go:340: WARNING: Syncthing should not run as a privileged or system user. Please consider using a normal user account.
[FBDWL] 2020/02/26 10:19:46.736518 static.go:68: INFO: Joined relay relay://51.158.96.181:22067
root@Synology:~#