users of two lync pool are not able to chat with each other- Lync 2010

IM Communication is not working between two Lyncpool users
When we try to send a message, user get the little thinking about it wheel, then a red cross next to the message.
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Manish KumarSr. Technical ConsultantAsked:
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Mohammed HamadaSenior IT ConsultantCommented:
Are all the services working on both pool front ends? is there any errors logged in the event viewer in the Lync part? please post it here
Manish KumarSr. Technical ConsultantAuthor Commented:
Lync sevices are working fine on all Lync servers

error showing at user's end
"the callee's primary pool failed to respond in a timely manner"
Mohammed HamadaSenior IT ConsultantCommented:
No please try to check the front end servers for errors related to the connectivity or latest errors in general.

there must be something related to the IM service or probably port connectivity.
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Manish KumarSr. Technical ConsultantAuthor Commented:
i looked into all front end servers but didn't find any relevant logs. I have copied all event source name.  Let me know if any specific source we need to look.

Source
LS Protocol Stack
LS Routing Data Sync Agent
LS File Transfer Agent Service
LS Audio-Video Conferencing Server
LS User Services
LS User Replicator
LS Address Book and Distribution List Expansion Web Service
LS Web Components Server
LS Location Information Service
LS InterCluster Routing
LS UserPin Service
LS Remote PowerShell
Manish KumarSr. Technical ConsultantAuthor Commented:
HI All,

This issue has been resolved by rebooting all front end servers one by one.

Still it is not clear what caused the issue as no alters related to issue have been found on front end servers.

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Manish KumarSr. Technical ConsultantAuthor Commented:
HI All,

This issue has been resolved by rebooting all front end servers one by one.

i didn't get any appropriate help so at last i rebooted all the servers one by one
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