Windows SBC flapping up and down every 30 mins to 1 hour

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Waldoppen

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Hi, we carried out an install yesterday with a new system v18 Update build 312 - self hosted in AWS Lightsail. The site has 24 Polycom VVX411 handsets and Windows SBC. All ok apart from the SBC connection keeps dropping... I've never had this issue on any other SBC we have out there and this is our 15th or so install in the past 2 years.

The SBC seemed to be stable when we had it on test with just 1 phone connected, but now with 24 phones it drops every 30 mins or so - here are the logs:

CRIT | 20230504-231155.520 | 3CX | SBC | 3744 | Log.cpp:158 | ====================== 3CX SmartSBC 18.1.36 @ AVT-SBC1 ======================
CRIT | 20230504-231155.520 | 3CX | SBC | 3744 | Log.cpp:159 | Log started: type = file, level = ERR, size = 104857600, resip = ERR, remote = -1
CRIT | 20230504-231155.536 | 3CX | SBC | 3744 | Bridge.cpp:28 | System Clock: resolution 0 microseconds, not monotonic
CRIT | 20230504-231155.569 | 3CX | SBC | 3744 | RPiTunnel.cpp:373 | Running in console mode
ERR | 20230504-231210.745 | 3CX | SBC | 3744 | TunnelTcp.cpp:620 | Secure tunnel is failed. Error 3: TLS handshake failed: TLS connect failed, too many attempts
ERR | 20230504-231210.745 | 3CX | SBC | 3744 | TunnelTcp.cpp:305 | Bridge failure on secure negotiation: TLS handshake failed: TLS connect failed, too many attempts
ERR | 20230504-231210.745 | 3CX | SBC | 3744 | TunnelTcp.cpp:607 | Socket error (10038):
ERR | 20230504-231210.745 | 3CX | SBC | 3744 | TunnelTcp.cpp:305 | Bridge failure on while begin to read a packet from tunnel: An operation was attempted on something that is not a socket.
ERR | 20230504-231210.745 | 3CX | SBC | 3744 | TunnelTcp.cpp:305 | Bridge failure on while processing TCP: Too long inactivity
ERR | 20230504-231224.594 | 3CX | SBC | 3744 | TunnelTcp.cpp:620 | Secure tunnel is failed. Error 3: TLS handshake failed: TLS connect failed, too many attempts
ERR | 20230504-231224.594 | 3CX | SBC | 3744 | TunnelTcp.cpp:305 | Bridge failure on secure negotiation: TLS handshake failed: TLS connect failed, too many attempts
ERR | 20230504-231224.594 | 3CX | SBC | 3744 | TunnelTcp.cpp:607 | Socket error (10038):
ERR | 20230504-231224.594 | 3CX | SBC | 3744 | TunnelTcp.cpp:305 | Bridge failure on while begin to read a packet from tunnel: An operation was attempted on something that is not a socket.

It's connected via a Draytek 2766 router on an ADSL connection both of which seem stable with no drops. I've rebooted the 3CX server and even changed the SBC with brand new hardware but no joy. I've just set the SBC config to "0" (TCP) security mode to see if that helps at all but that is just a punt really.

I am taking a different router and might try an SBC phone (T54W) on site to see if that is more stable, although they are only meant for 10 handsets max...

Any insight would be greatly appreciated!
 
Make sure you don't have an IP conflict. It would act like that if there's one.
 
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Make sure you don't have an IP conflict. It would act like that if there's one.
Many thanks - we went to site, unplugged everything, reset the switches, repatched all the phones and it's ok now! Simple in the end :)
 
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