Receiving Log of Servers down for 9-10 Seconds

Found the issue to be a bug with the help of F5 Impact Pool members monitored by the affected health monitor are erroneously marked down. Symptoms As a result of this issue, you may encounter the following symptoms: Pool members are marked down when they are actually up. A packet capture on the affected monitor traffic shows that the BIG-IP system receives a SYN/ACK from a pool member and responds with an ICMP destination unreachable message. Here is the link to a solution article that details the issue. SOL15907: The BIG-IP system may incorrectly send an ICMP destination unreachable message to a server responding to health monitor traffic on TCP source port 54321 https://support.f5.com/kb/en-us/solutions/public/15000/900/sol15907.html SOL13123: Managing BIG-IP product hotfixes (11.x) https://support.f5.com/kb/en-us/solutions/public/13000/100/sol13123/