Different browsers problems

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Project Description:
I have migrated a chat from a dedicated debian server to a new CLOUD server.
Everything is ok, after weeks.BUT
Last problem::
messages sent by an user to a second opponent user arrives correctly, the answer of the second to the first, as well.
Now: it works PERFECTLY only between Safari user to Chrome user and vice-versa.
With Internet explorer it does not work.
With other combination like Firefox/Chrome it works one way but not for the answer.
My GUEST: this is a problem of settings for the different browsers.
But I do not know: which software: Stomp?ActiveMQ?Orbited?PhP?
If you know the answer , you should fix the problem in less that one hour.
Just answer if you know how to fix browsers issues.

Skills required:
PHP, Software Architecture, Software Testing
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$ 250
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