I was in the middle of upgrade t= o 1.1.9. I brought one node with 1.1.9 while the other were running on 1.1.= 5. Once one of the node was on 1.1.9 it is no longer recognizing other node= s in the ring.

On 192.168.56.10 and 11

192.168.56.10  =3BDC1-Cass  =3B  =3BRAC1 &nbs= p=3B  =3B  =3B  =3BUp  =3B  =3B Normal  =3B28.06 GB=  =3B  =3B  =3B  =3B50.00%  =3B  =3B  =3B  = =3B  =3B  =3B  =3B0  =3B  =3B  =3B  =3B  = =3B  =3B  =3B  =3B  =3B  =3B  =3B  =3B  =3B=  =3B  =3B  =3B  =3B  =3B  =3B  =3B  =3B&nb= sp=3B
192.168.56.11  =3BDC1-Cass  =3B  =3BRAC1  = =3B  =3B  =3B  =3BUp  =3B  =3B Normal  =3B31.59 GB =  =3B  =3B  =3B  =3B25.00%  =3B  =3B  =3B  = =3B  =3B  =3B  =3B42535295865117307932921825928971026432  = =3B  =3B  =3B
192.168.56.12  =3BDC1-Cass  =3B &nb= sp=3BRAC1  =3B  =3B  =3B  =3BDown  =3B Normal  =3B2= 9.02 GB  =3B  =3B  =3B  =3B25.00%  =3B  =3B  = =3B  =3B  =3B  =3B  =3B850705917302346158658436518579420528= 64  =3B  =3B

On 192.168.56.= 12

192.168.56.10  =3BDC1-Cass  =3B  = =3BRAC1  =3B  =3B  =3B  =3BDown  =3B  =3B Normal &n= bsp=3B28.06 GB  =3B  =3B  =3B  =3B50.00%  =3B  =3B =  =3B  =3B  =3B  =3B  =3B0  =3B  =3B  =3B &n= bsp=3B  =3B  =3B  =3B  =3B  =3B  =3B  =3B  = =3B  =3B  =3B  =3B  =3B  =3B  =3B  =3B  =3B=  =3B =3B
192.168.56.11  =3BDC1-Cass  =3B  = =3BRAC1  =3B  =3B  =3B  =3BDown  =3B  =3B Normal &n= bsp=3B31.59 GB  =3B  =3B  =3B  =3B25.00%  =3B  =3B =  =3B  =3B  =3B  =3B  =3B4253529586511730793292182592897= 1026432  =3B  =3B  =3B
192.168.56.12  =3BDC1-Cass=  =3B  =3BRAC1  =3B  =3B  =3B  =3BUp  =3B Norma= l  =3B29.02 GB  =3B  =3B  =3B  =3B25.00%  =3B  = =3B  =3B  =3B  =3B  =3B  =3B850705917302346158658436518= 57942052864  =3B  =3B

I do not see anything in the logs that tells me that there is a gossip iss= ue.

nodetool info
Token  =3B &n= bsp=3B  =3B  =3B  =3B  =3B: 8507059173023461586584365185794= 2052864
Gossip active  =3B  =3B: true
Thrift ac= tive  =3B  =3B: true
Load  =3B  =3B  =3B &nbs= p=3B  =3B  =3B : 29.05 GB
Generation No  =3B  =3B= : 1365114563
Uptime (seconds) : 2127
Heap Memory (MB) := 848.71 / 7945.94
Exceptions  =3B  =3B  =3B : 0
=
Key Cache  =3B  =3B  =3B  =3B: size 2208 (bytes)=2C ca= pacity 104857584 (bytes)=2C 1056 hits=2C 1099 requests=2C 0.961 recent hit = rate=2C 14400 save period in seconds
Row Cache  =3B  =3B =  =3B  =3B: size 0 (bytes)=2C capacity 0 (bytes)=2C 0 hits=2C 0 requ= ests=2C NaN recent hit rate=2C 0 save period in seconds
nodetool info
Token  =3B  =3B  =3B &= nbsp=3B  =3B  =3B: 42535295865117307932921825928971026432
Gossip active  =3B  =3B: true
Thrift active  =3B &nb= sp=3B: true
Load  =3B  =3B  =3B  =3B  =3B &nb= sp=3B : 31.59 GB
Generation No  =3B  =3B: 1364413038
Uptime (seconds) : 703904
Heap Memory (MB) : 733.02 / 7945.= 94
Exceptions  =3B  =3B  =3B : 1
Key Cache =  =3B  =3B  =3B  =3B: size 3693312 (bytes)=2C capacity 10485= 7584 (bytes)=2C 26071678 hits=2C 26616282 requests=2C 0.980 recent hit rate= =2C 14400 save period in seconds
Row Cache  =3B  =3B &nbs= p=3B  =3B: size 0 (bytes)=2C capacity 0 (bytes)=2C 0 hits=2C 0 requests= =2C NaN recent hit rate=2C 0 save period in seconds

There is no firewall between the nodes and I can reac= h each other on storage port. =3B
What else should I be looki= ng at to find root cause? Appreciate your inputs.
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