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Cannot launch instances anymore due to RabbitMQ errors

I used to be able to launch instances from this setup (Packstack single node install, Queens) with no problem. I haven't made changes to the network or anything within OpenStack in months. Now, for whatever reason, I can no longer launch instances - they get stuck in Scheduling. Looking in the nova-scheduler log, I can see rabbitmq errors, and the rabbitmq log is full of:

=ERROR REPORT==== 27-May-2020::15:58:26 ===

closing AMQP connection <0.17487.0> (<node's ip:47928="" -=""> <node's ip="">:5672):

{handshake_timeout,frame_header}

I've tried restarting the service and even full on rebooting, I've reset the guest password to guest, and blown away mnesia - none of these made any difference at all.

What else can I try? Really disturbed that this would happen when nothing has been changed...:-/

Cannot launch instances anymore due to RabbitMQ errors

I used to be able to launch instances from this setup (Packstack single node install, Queens) with no problem. I haven't made changes to the network or anything within OpenStack in months. Now, for whatever reason, I can no longer launch instances - they get stuck in Scheduling. Looking in the nova-scheduler log, I can see rabbitmq errors, and the rabbitmq log is full of:

=ERROR REPORT==== 27-May-2020::15:58:26 ===

closing AMQP connection <0.17487.0> (<node's ip:47928="" -=""> <node's ip="">:5672):

{handshake_timeout,frame_header}

I've tried restarting the service and even full on rebooting, I've reset the guest password to guest, and blown away mnesia - none of these made any difference at all.

What else Looking back at earlier logs, I can I try? Really disturbed that this would happen when nothing has been changed...:-/see these errors occasionally were in there as far back as I have logs (January), but they used to still work sometimes. But now it's just giving an error every time.

rabbitmqctl list_connections shows a number of running connections, but the last one in there is from 4 days ago.

Cannot launch instances anymore due to RabbitMQ errors

I used to be able to launch instances from this setup (Packstack single node install, Queens) with no problem. I haven't made changes to the network or anything within OpenStack in months. Now, for whatever reason, I can no longer launch instances - they get stuck in Scheduling. Looking in the nova-scheduler log, I can see rabbitmq errors, and the rabbitmq log is full of:

=ERROR REPORT==== 27-May-2020::15:58:26 ===

closing AMQP connection <0.17487.0> (<node's ip:47928="" -=""> <node's ip="">:5672):

{handshake_timeout,frame_header}

I've tried restarting the service and even full on rebooting, I've reset the guest password to guest, and blown away mnesia - none of these made any difference at all.

Looking back at earlier logs, I can see these errors occasionally were in there as far back as I have logs (January), but they used to still work sometimes. But now it's just giving an error every time.

rabbitmqctl list_connections shows a number of running connections, but the last one in there is from shows in the logs as initiating 4 days ago.ago. I've rebooted and restarted numerous times since then, so that seems interesting.