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Domain A accounts are added to local administrators group of domain B servers?<br />
<br />
OR<br />
<br />
U have granted them to logon locally user rights on domain B servers through group policy in domain B?<br />
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Else error is expected
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Resetting trust would be required only when name resolution is failing..<br />
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There is no replication between parent and child domain for domain directory partition<br />
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U must had name resolution issue which you had to resolve 1st followed by you may reset the trust (this is not required for domains in same forest as by default transitive trust is available between al domains in same forest)<br />
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Actually I miss understood your question which clearly states that you are able to connect with IP but not with name..
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We are facing an issue where all of a sudden cannot login to any of the servers in Domain B (Child DOmain) with Domain A accounts. it gives Logon Attempt Failed, but when you RDP to the IP address of the Server then you can login just fine. <br />
I have checked just about anything and it seems there is a kerberos pre authentication issue. <br />
do anyone have any idea as to what might have caused this and how to pin point the issue?
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We are facing an issue where all of a sudden cannot login to any of the servers in Domain B (Child DOmain) with Domain A accounts. it gives Logon Attempt Failed, but when you RDP to the IP address of the Server then you can login just fine. 
I have checked just about anything and it seems there is a kerberos pre authentication issue. 
do anyone have any idea as to what might have caused this and how to pin point the issue?

fail to Login to servers in domain B from Account in domain A (Child Domains - same forest)

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