Windows agent's offline

Hi, suddenly all of workstations are offline

when i try delete workstation and register it again a i have error:

Nie udało się zarejestrować hosta.
Failed.
500

{
"context" :
{
"$module" : "mms_vsa64_29240",
"Domain" : "AGENT_CORE",
"HttpStatus" : "0x1f4",
"Reason" : "NETWORK_ERROR",
"code" : "0x3"
},
"domain" : "global",
"origin" :
{
"code" : 4,
"fields" :
{
"$module" : "mms_vsa64_29240",
"Domain" : "AGENT_CORE",
"HttpStatus" : "",
"Reason" : "NETWORK_ERROR",
"code" : ""
},
"linetag" : "0x644c32798ed56817, d:\\425\\enterprise\\common\\aakore_client\\impl\\akk_client.cpp:199, AakoreClient::AkkClient::Register",
"module" : 722,
"suberror" :
{
"code" : 23,
"fields" :
{
"$module" : "mms_vsa64_29240",
"status" : ""
},
"linetag" : "0x5b89cde5313bd154, d:\\425\\enterprise\\common\\http\\error.cpp:99, Http::CreateError",
"module" : 583,
"suberror" : null,
"text" : "{\"domain\":\"AGENT_CORE\",\"code\":\"NETWORK_ERROR\",\"debug\":{\"msg\":\"ensure agent registration: registering with agent manager: getting openid configuration: Get h t t p s ://Acronis.sp.gorlice:9877/.well-known/openid-configuration: dial tcp 127.0.0.1:8985: connectex: Nie można nawiązać połączenia, ponieważ komputer docelowy aktywnie go odmawia.\"}}"
},
"text" : "{\"domain\":\"AGENT_CORE\",\"code\":\"NETWORK_ERROR\",\"debug\":{\"msg\":\"ensure agent registration: registering with agent manager: getting openid configuration: Get h t t p s ://Acronis.sp.gorlice:9877/.well-known/openid-configuration: dial tcp 127.0.0.1:8985: connectex: Nie można nawiązać połączenia, ponieważ komputer docelowy aktywnie go odmawia.\"}}"
},
"reason" : "internalError",
"serCode" : "0x02d20004+0x02470017"
}

PLS HELP