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Cisco Switch 4506 SSH and Telnet disconnection

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Cisco Switch 4506 SUP-4 ,  VRF Running ,

SSH and telnet Session not able take control the switch , Console working fine .

WorkAround : 

1) Reload ( its will work more than 10 days and Stoped the SSH and Telnet Session )

2) Line VTY 0 4 , no exec  (its working not more than 3 days and ssh and telnet not working)

3) instead of MGT IP ,open SSH with  Other VRF IP SSH working  ,than tried MGT IP its working for few days , than Stoped SSH and telnet .

Any one facing this issue..,

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Beginner

we tried IOS upgrade also ,

IOS upgraded cat4500-entservicesk9-mz.122-53.SG2.bin to cat4500-entservicesk9-mz.122-53.SG6.bin,

any one known permanent fixup this issue..,

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