Unable to Log In to the Synology Desktop and then Page Not Found Error

[duckjpsgaintas]

I am experiencing an issue with logging into the Synology desktop from the login page(xx.xx.xx.xx:5000). After entering the password, the waiting icon keeps spinning, and upon refreshing the page, it displays 'Sorry, the page you are looking for is not found.'

My device is a DS920+ running version 69057. The GPU passthrough has been set up, and the correct SN number is registered. I do not use a Synology online account. It was functioning normally until recently. After my last login attempt, I suddenly became unable to log in. Even after entering the correct login information, the waiting icon just keeps spinning without successful login. Refreshing the page shows the message, 'Sorry, the page you are looking for is not found.' After restarting the system, the login page just disappeared, and the same Page Not Found message kept appearing.

Following online advice, I replaced the /usr/lib/libsynopkg.so.1 and /usr/lib/libsynoshare.so.7 files, which brought back the login page, but did not fix the login issue. The page disappears again after attempting to log in.

Really need some help. Thank you.

[duckjpsgaintas]

Additionally, various functions within the Synology system seem to be operating normally. I can access the web interfaces of Docker applications installed in Synology. It seems that only Synology itself is preventing me from logging in.