My Zimbra Desktop 7.0.1 is showing this error and does not sync properly. Please help.


Failure communicating with remote server. Please try again later.
(debug info)
error while proxying request to target server: HTTP/1.1 502 Proxy Error Exception:

com.zimbra.common.service.ServiceException: error while proxying request to target server: HTTP/1.1 502 Proxy Error
ExceptionIdffline-poller-342719@tcsin.com:1304663243437:85f8f588b365c936
Code:service.PROXY_ERROR Argurl, STR, "https://219.64.33.136/service/soap/WaitSetRequest")
at com.zimbra.common.service.ServiceException.PROXY_E RROR(ServiceException.java:313)
at com.zimbra.common.soap.SoapHttpTransport.invoke(So apHttpTransport.java:247)
at com.zimbra.common.soap.SoapHttpTransport.invoke(So apHttpTransport.java:164)
at com.zimbra.common.soap.SoapTransport.invoke(SoapTr ansport.java:397)
at com.zimbra.common.soap.SoapTransport.invokeWithout Session(SoapTransport.java:383)
at com.zimbra.cs.mailbox.ZcsMailbox.sendRequest(ZcsMa ilbox.java:677)
at com.zimbra.cs.mailbox.ZcsMailbox.sendRequest(ZcsMa ilbox.java:639)
at com.zimbra.cs.mailbox.ZcsMailbox.sendRequest(ZcsMa ilbox.java:634)
at com.zimbra.cs.mailbox.ZcsMailbox.sendRequest(ZcsMa ilbox.java:627)
at com.zimbra.cs.mailbox.ZcsMailbox.sendRequest(ZcsMa ilbox.java:623)
at com.zimbra.cs.mailbox.OfflinePoller.waitsetRequest (OfflinePoller.java:124)
at com.zimbra.cs.mailbox.OfflinePoller.runPoll(Offlin ePoller.java:74)
at com.zimbra.cs.mailbox.OfflinePoller.run(OfflinePol ler.java:66)
at java.lang.Thread.run(Unknown Source)