Hi @kapildev87 ,
When you say "login works fine" I assume that you mean the web login on the portal? If so, then check your traffic and system logs (or GlobalProtect logs for 9.1+) for dropped traffic or errors. If you can't find the issue there here are in-depth troubleshooting steps -> https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000ClkBCAS.
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