RD Connection broker failed to initialize

We have an RD farm with two session hosts and a gateway that has been working. It has been in use for several months and I don't think anything was changed. I was informed that it stopped working and I do see evidence of this. I've been troubleshooting and see that the hosts both left the farm last week with this error message:

Log Name:      Microsoft-Windows-TerminalServices-SessionBroker-Client/Operational
Source:        Microsoft-Windows-TerminalServices-SessionBroker-Client
Date:          7/19/2013 3:06:42 PM
Event ID:      1283
Task Category: Connection Broker Client terminate
Level:         Information
Keywords:      
User:          NETWORK SERVICE
Computer:      server08.domain.com
Description:
Remote Desktop Services successfully left a farm on the Connection Broker server gate.domain.com.


Since then whenever someone connects we get three events in a row in the same log:

Event ID:      1301
Task Category: RD Connection Broker Client processes request from a user
User:          NETWORK SERVICE
Computer:      server08.domain.com
Description:
Remote Desktop Connection Broker Client received request for redirection. 
User : DOMAIN\ddawson 
RDP Client Version : 5

Event ID:      1296
Task Category: RD Connection Broker Client processes request from a user
Computer:      server08.domain.com
Description:
Remote Desktop Connection Broker Client failed while getting redirection packet from Connection Broker.
User : DOMAIN\ddawson 
HRESULT = 0x88150002

Event ID:      1306
Task Category: RD Connection Broker Client processes request from a user
Computer:      server08.domain.com
Description:
Remote Desktop Connection Broker Client failed to redirect the user DOMAIN\ddawson. 
HRESULT = 0x88150002


I'm not sure which direction to go. I've confirmed that the session hosts are both in local group "Session Broker Computers" on our Session Broker. On each host I've removed them from the farm and put them back in. When I do that I get the error:

Event ID:      1284
Task Category: Connection Broker Client start up
Computer:      server08.domain.com
Description:
Remote Desktop Connection Broker Client failed to initialize while joining the Connection Broker on server gate.domain.com.
HRESULT = 0x80070534

I've read the articles telling me to test connectivity. These computers are all on the same physical network and I can RDP and PING back and forth between them all. What can I try next?