Glorytun never-ending errors in syslog

[enricodetoma]

Current Behavior

I have these never-ending errors in the syslog on the VPS:

2025-03-03T23:06:51.095411+01:00 admin166784342 ss-server[781]: failed to handshake with 91.80.29.87: authentication error
2025-03-03T23:06:51.579773+01:00 admin166784342 glorytun-tcp-run[623]: ::ffff:91.80.29.87.7386: connected
2025-03-03T23:06:51.579866+01:00 admin166784342 glorytun-tcp-run[623]: couldn't set socket option `TCP_USER_TIMEOUT'
2025-03-03T23:06:51.579886+01:00 admin166784342 glorytun-tcp-run[623]: peer sends a bad hash!
2025-03-03T23:06:51.579903+01:00 admin166784342 glorytun-tcp-run[623]: ::ffff:91.80.29.87.7386: key exchange failed
2025-03-03T23:06:52.660277+01:00 admin166784342 glorytun-tcp-run[623]: ::ffff:91.80.29.87.7305: connected
2025-03-03T23:06:52.660379+01:00 admin166784342 glorytun-tcp-run[623]: couldn't set socket option `TCP_USER_TIMEOUT'
2025-03-03T23:06:52.660399+01:00 admin166784342 glorytun-tcp-run[623]: peer sends a bad hash!
2025-03-03T23:06:52.660415+01:00 admin166784342 glorytun-tcp-run[623]: ::ffff:91.80.29.87.7305: key exchange failed

What can I do to remove them? 91.80.29.87 is not one of the wan addresses (maybe it was before, the IP is dynamic).
I had to setup logrotate because the log filled all the available space on the filesystem.
Can I just disable IPv6 on the VPS?

Specifications

• OpenMPTCProuter version: openmptcprouter v0.62-snapshot-6.6 r0+28431-92e020b50f
• OpenMPTCProuter VPS version: 6.6.36-x64v3-xanmod1 0.1031
• OpenMPTCProuter VPS provider: Aruba (IT)
• OpenMPTCProuter platform: x86_64)
• Country: IT

[Ysurac]

If it's not your of your IP, can be an IP scan. You can block the IP with shorewall drop 91.80.29.87
Why disable IPv6 ? as it was enabled on installation all is configured with IPv6 support.

[enricodetoma]

The point is: I don't think it's an IP scan. It is from my same provider, so I guess this was my previous dynamic IP.
For example, now I get this log:

2025-03-06T21:41:10.266051+01:00 admin166784342 ss-server[781]: failed to handshake with 37.159.54.129: authentication error
2025-03-06T21:41:11.306797+01:00 admin166784342 glorytun-tcp-run[623]: ::ffff:37.159.54.129.3491: connected
2025-03-06T21:41:11.306904+01:00 admin166784342 glorytun-tcp-run[623]: couldn't set socket option `TCP_USER_TIMEOUT'

and again, 37.159.54.129 is from exactly my same provider.
It is strange that I get continuous IP scans to my VPS, all from my WAN1 provider.
I also get "Looping ruote detected" as warning on WAN1 on the router status page.