QNAP Looses Network Connection when FTP Service is Enabled
Posted: Thu Feb 18, 2021 7:04 am
I recently encountered a need to enable the FTP service on my QNAP. I also opened ports 20 & 21 so it can be accessed remotely. It all worked fine however every so often I loose network connectivity. Qfinder Pro is unable to find it, my shares stop working in Windows and I'm unable to log into the web interface. If I shut it down by holding in the power button on the device then start it up again everything is working fine. I do notice the following warning in the system log after:
"[Network & Virtual Switch] Failed to connect to the internet. System default gateway "Virtual Switch 1" and all adapters failed to connect to the internet after checking NCSI."
Sometimes it happens again within 10 minutes after restarting. Other times it can run for a few days before this happens. However if I turn off the FTP service it runs fine indefinitely. I have noticed a lot of system log warnings such as this one:
"Warning 2021-02-16 08:02:30 anonymous 178.32.197.85 --- FTP --- Failed to log in"
I'm wondering if I'm being attacked and QNAP's response is to disconnect the LAN. Any suggestions would be appreciated. Thanks
"[Network & Virtual Switch] Failed to connect to the internet. System default gateway "Virtual Switch 1" and all adapters failed to connect to the internet after checking NCSI."
Sometimes it happens again within 10 minutes after restarting. Other times it can run for a few days before this happens. However if I turn off the FTP service it runs fine indefinitely. I have noticed a lot of system log warnings such as this one:
"Warning 2021-02-16 08:02:30 anonymous 178.32.197.85 --- FTP --- Failed to log in"
I'm wondering if I'm being attacked and QNAP's response is to disconnect the LAN. Any suggestions would be appreciated. Thanks